![\"Curly-Haired](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/curly-hair-man.jpg\")
Curly Hair<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Roughly 11%<\/em><\/li>\n<\/ul>\n
Curly hair<\/a><\/strong> is something a lot of people love, and actually have to fake. They might do this with a curling iron, but the curls they add are small and picked out to fit a specific look. For those with truly curly hair, having the chance to “pick” where their curls show up is nonexistent. It is a great look, but very few people have naturally curly hair. We do not mean small curls when we state this, by the way.<\/p>\n![\"Curly-Haired](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/curly-hair-woman.jpg\")
Woman holding her curly hair. Photo Credit: PhotoSunnyDays\/Shutterstock<\/em><\/figcaption><\/figure>\nFor example, if you do not brush your hair well and have a few curls at the bottom or if your bangs get so long they curl up. We mean people who have most sections of their hair curl on them naturally. These people are pretty rare, funny enough. Curly hair is one of the world’s rare genetic traits because only 11% of the world’s population has it. In fact, there are some people who have siblings with curly hair while they do not, showing just how rare it can be even in the same immediate family.<\/p>\n
<\/p>\n![\"Woman](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/blonde-hair-woman.jpg\")
Woman with blonde hair. Photo Credit: YuriyZhuravov\/Shutterstock<\/em><\/figcaption><\/figure>\nNatural Blonde Hair<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Between 2 to 6%<\/em><\/li>\n<\/ul>\n
We should make sure to reference here that when we state “natural blonde hair,” we mean those that are only blonde. Not those that have brown or black within the hair, aka “dirty blonde” hair. It is widely assumed we have more blonde people in the world than we actually do. “Blonde” is one of the most popular hair colors that people dye their hair to fit. It is stated that three in four caucasian women dye their hair blonde. This is why there are significantly more “bottle blondes<\/a><\/strong>” than natural blondes.<\/p>\n![\"Woman](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/short-blonde-hair.jpg\")
Woman with short blonde hair. Photo Credit: Kiuikson\/Shutterstock<\/em><\/figcaption><\/figure>\nMoreover, natural blonde hair is more common for children than adults. This is due to the fact that hair tends to darken as we age, causing more adults to end up with brown or black hair before going grey or white. It is tough to get a true percentage of adults with this natural color, again due to the mass popularity of dying hair. However, due to the help of hairdressers and truthful people, it has been determined between 2 to 6% of adults have naturally blonde hair in the world today.<\/p>\n
<\/p>\n![\"Inverted](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/inverted-navel.jpeg\")
Woman with flat belly inverted navel. Photo Credit: Michaelheim\/Shutterstock<\/em><\/figcaption><\/figure>\nInverted Navel<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> 10%<\/em><\/li>\n<\/ul>\n
Rare genetic traits like an inverted navel can be really odd to see among adults. However, they are not exactly crazy to see among young children. Children that are newborns all the way up to a few years old may have what is commonly called an “outie belly button.” Of course, the true name for this is an inverted navel, but most people do not know the true medical term for it. Most children who have an inverted naval will eventually see it sink in to look normal.<\/p>\n![\"Inverted](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_1494917282.jpg\")
Inverted navel. Photo Credit: WIRACHAIPHOTO\/Shutterstock<\/em><\/figcaption><\/figure>\nAlthough, it can last for others into their teenage years. It does usually go away before that timeframe, but the cases change often depending on the size of the person. While some believe that the naval being inverted or not is determined by how the umbilical cord is cut, this is not the case. How the scar heals there afterward is really the biggest factor. Sometimes, the child might even have a small hernia at birth that causes it too. Today, only 10% of adults<\/a><\/strong> have any form of inverted naval.<\/p>\n<\/p>\n![\"Woman](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2020\/08\/woman-sleeping.jpg\")
Woman Sleeping. Photo Credit: Lia Koltyrina\/Shutterstock<\/em><\/figcaption><\/figure>\nThe DEC2 Gene<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Around 3%<\/em><\/li>\n<\/ul>\n
The DEC2 gene is one of the rare genetic traits that many wish they had. People with the DEC2 gene<\/a><\/strong> do not need to sleep as much as a normal person to function at their body’s maximum capacity. Most people need around 8 hours of proper sleep<\/a> per night for them to function properly. Sleep<\/a> is important for the function of our brain and it also helps our bodies heal from numerous issues. Doctors might recommend sleep for people with a cold or flu due to this.<\/p>\n![\"Sleeping](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2020\/06\/sleeping-man.jpg\")
Exhausted man sleeping. Photo Credit: GPointStudio\/Shutterstock<\/em><\/figcaption><\/figure>\nOften called the “no sleep” gene, that is actually a common mistake. People with DEC2 need sleep, but only 4 to 6 hours at the most. Some might say “well I sleep that much so I might have it.” That is not always true. Some people have bad sleep patterns that cause a lack of sleep to occur. Yet these people need more sleep whereas those with DEC2 simply go through their full natural sleep cycle in less time than most. Therefore, they do not need the extra hours others do.<\/p>\n
<\/p>\n![\"Wisdom](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/wisdom-teeth-4.jpg\")
Wisdom teeth X-ray. Photo Credit: DeymosHR\/Shutterstock<\/em><\/figcaption><\/figure>\nBorn Without Wisdom Teeth<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Around 20%<\/em><\/li>\n<\/ul>\n
Most people end up having their wisdom teeth removed before they reach adulthood. Of course, some of these people did not need to remove them. Others were told to do so for the health of their teeth. When they come in, wisdom teeth will grow and push on the rest of your teeth. This can cause pain and even make your teeth crooked at times. Yet people went thousands of years without this problem, what happened? Funny enough, some people are born without them<\/a><\/strong>.<\/p>\n![\"Shutterstock](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_231350425.jpg\")
Growing wisdom teeth pain on X-ray. Photo Credit: Radu Bercan\/Shutterstock<\/em><\/figcaption><\/figure>\nNearly 100% of all indigenous Mexicans do not have wisdom teeth from birth. Yet nearly all Tasmanian Aborigines do. This presents a situation in which evolution dictated need, causing people in different parts of the world to need or not need wisdom teeth. Due to this, roughly 20% of the planet is now born without wisdom teeth. This used to be rarer than it is today but the percentage is climbing, meaning more will be born without them as we go into the future.<\/p>\n
<\/p>\n![\"Man](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/03\/man-about-to-sneeze.jpg\")
Man about to sneeze. Photo Credit: Tattoboo\/Shutterstock<\/em><\/figcaption><\/figure>\nPhotic Sneeze Reflex<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> 11 to 35%<\/em><\/li>\n<\/ul>\n
One of the world’s rare genetic traits that can be quite annoying for people, the photic sneeze reflex<\/a><\/strong> is a condition where light causes someone to sneeze. We do not mean random light, such as one in your kitchen or the light from your television. It is usually only triggered by looking at very bright lights and other various stimuli. The reflex affects everyone who has it differently. Some can handle brighter lights than others, for example. It actually has a more official name, which is quite funny.<\/p>\n![\"Photic](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_385321261.jpg\")
Photic sneeze reflex. Photo Credit: AndreyUG\/Shutterstock<\/em><\/figcaption><\/figure>\nThat name is Autosomal Dominant Compelling Helio-Ophthalmic Outburst. This is abbreviated as literally ACHOO. We know, we know. Of course, others with a lesser sense of humor also refer to it as “photosneezia.” It’s hard to get an accurate number of people affected by the trait. This is why a wide range of 11 to 35% of the world is said to have it. However, according to the Journal of the American Optometric Association, the majority of those affected by it are actually white females.<\/p>\n
<\/p>\n![\"Female](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/female-mortons-toe.jpg\")
Female Morton’s toe. Photo Credit: Radoslav Cajkovic\/Shutterstock<\/em><\/figcaption><\/figure>\nMorton’s Toe<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Roughly 10%<\/em><\/li>\n<\/ul>\n
Morton’s Toe<\/a><\/strong> is quite often something that looks weird to everyone who sees it. Most people have five toes on each foot, with the literal “big toe” on both feet. Of course, it is located on the far right of a person’s right foot, while on the far left of a person’s left foot. For most people, the “big toe” is referred to as such because it is the biggest toe on the foot. But for those with Morton’s Toe, that is not the case.<\/p>\n![\"Morton's](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/mortons-toe.jpg\")
Morton’s Toe. Photo Credit: Lisa Culton\/Shutterstock<\/em><\/figcaption><\/figure>\nFor those people, the “big toe” is actually smaller than their second toe. The look of those with this genetic trait often varies among those with it. For some, it is the same height as their big toe but not as wide. For others, it is just as wide as the big toe. Meanwhile, for others, it is just as tall and wide as the big toe. You might get some who see the second toe grow taller or wider than the big toe as well. Interestingly, the Statue of Liberty in New York actually has the Morton’s Toe genetic trait too.<\/p>\n
<\/p>\n![\"X-Lines](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_333741881.jpg\")
X-Lines on hand. Photo Credit: LuFeeTheBear\/Shutterstock<\/em><\/figcaption><\/figure>\nX-Lines On Hands<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> 3%<\/em><\/span><\/li>\n<\/ul>\n
Everyone has lines on their hands, but the way those lines look will vary widely among literally everyone. Yet for some, the way their lines look will be very different. For some, there is a rare phenomenon where the letter “X” will be formed on BOTH hands. The writer of this very article actually has this exact genetic trait. For the ancient<\/a> Egyptians and Greeks, there were many meanings behind the “X-Hands.” They used to believe it was a sign of strong character or that a person was destined for greatness.<\/p>\n![\"Shutterstock](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_2243857435.jpg\")
X-Lines on the right hand. Photo Credit: tawanroong\/Shutterstock<\/em><\/figcaption><\/figure>\nOf course, “palmistry<\/a>,<\/strong>” or the foretelling of the future using a person’s palms, is complete garbage. It means nothing to have an “X” on your hands. However, it is still one of the world’s rare genetic traits as only 3% of the human population has this. This might differ a bit among our primate friends such as chimps or great apes. To be fair, it made sense to think the “X” meant something as Alexander the Great among other leaders in history had this “X” letter on both hands. Therefore, there “might” be something to it.<\/p>\n<\/p>\n![\"What,to,do?,the,man,had,a,horn,on,his\"](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_712698646.jpg\")
Horn on a man’s head. Photo Credit: ROMSVETNIK\/Shutterstock<\/em><\/figcaption><\/figure>\nCutaneous Horn<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Less Than 10%<\/em><\/li>\n<\/ul>\n
People who have cutaneous horns<\/a><\/strong> were often referred to as devils due to religious groups not grasping scientific phenomenons. This specific condition has been around for centuries, and religious types pounced whenever they saw someone with one or more horns on their body. Referred to as cutaneous horns or cornu cutaneum, the horn or horns a person gets are simply unusual skin tumors.<\/p>\n![\"Cutaneous](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/cutaneous-horn-in-right-ear.jpg\")
Cutaneous horn in the right ear. Photo Credit: Wikipedia<\/em><\/figcaption><\/figure>\nBasically, these horns can appear pretty much anywhere on a person’s body. They often are seen on the head or face. But they can also come out of the arms or legs too. While most of the horns can be relatively small, there are rare cases where they grow very large. A French woman named Madame Dimanche had a horn that measured out to 10 inches! The good thing is that these horns can be removed today. The way it is done will differ depending on size and how cancerous it is or is not.<\/p>\n
<\/p>\n![\"Shutterstock](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_1224734254.jpg\")
Diagnostician holding in hand a positive HIV test. Photo Credit: mikeforemniakowski\/Shutterstock<\/em><\/figcaption><\/figure>\nHIV Resistance Mutation<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Around 1%<\/em><\/li>\n<\/ul>\n
HIV\/AIDS might not be as much of a death sentence as it used to be. Human Immunodeficiency Virus (HIV) itself causes immune system problems. This can cause someone to have trouble fighting off infections or viruses that others might be able to combat just fine. If it is not treated properly, HIV can turn into Acquired Immunodeficiency Syndrome (AIDS). Due to the rise of scientific breakthroughs<\/a> in this field, we are able to keep many people from ever ending up with AIDS if HIV is caught early enough. HIV can pass from person to person via a person’s main bodily fluids, such as their blood or sperm.<\/p>\n![\"Image](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2019\/08\/hiv-blood.jpg\")
Image concept with the result of the HIV test. Photo Credit: KTSdesign\/Shutterstock<\/em><\/figcaption><\/figure>\nAlthough, women can pass it to men by the man being inside them at all. Sweat and spit, however, will not transfer it. Some have nothing to worry about though, as they are completely resistant to HIV. Those people have a rare genetic mutation called CCR5 Delta 32<\/a><\/strong>. The mutation caused the CCR5 co-receptor to be far smaller than normal, making it difficult for the HIV virus to enter cells. The main receptor is closed, preventing the virus from ever taking hold of a person’s body. Today, scientists are trying to mimic this via stem cells using cells from HIV-immune individuals. Making these people incredibly important.<\/p>\n<\/p>\n![\"Heterochromia\"](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/heterochromia.jpg\")
Human heterochromia on the eyes of a girl. Photo Credit: Sruilk\/Shutterstock<\/em><\/figcaption><\/figure>\nHeterochromia<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> 1%<\/em><\/li>\n<\/ul>\n
Heterochromia<\/a><\/strong> is one of the rare genetic traits a lot of people know about by now. The reason for this is likely due to how obvious it is that a person has it. This is a genetic trait that causes a person to have two different colored eyes. However, those with different colored sections in each eye are also said to have this. In rare cases, a person with this trait might also see a difference in color for other body parts too. This can be a difference in skin color, hair, etc.<\/p>\n![\"Heterochromia](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/heterochromia-eye.jpg\")
Closeup of a heterochromia eye. Photo Credit: Luiz B Renaudin\/Shutterstock<\/em><\/figcaption><\/figure>\nAll of this comes down to how the genetic mutation works. Our eye color is affected by the melanin in our body. Heterochromia is the result of a mutation that led to an error in the distribution of melanin before a person was born. Of course, the most dramatic and obvious heterochromia cases are those with broadly different eye colors, specifically in the iris. It can be really wild to see but often beautiful. Interestingly, only 1% of the world’s population has any version of heterochromia.<\/p>\n
<\/p>\n![\"Shutterstock](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_657764857.jpg\")
Cheerful redhead girl with flying curly hair. Photo Credit: Cookie Studio\/Shutterstock<\/em><\/figcaption><\/figure>\nRed Hair<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> 1 to 2%<\/em><\/li>\n<\/ul>\n
If you thought having naturally blonde hair as an adult seemed rare, having red hair<\/a><\/strong> is even rarer. Many assume most people from Ireland have red hair, or at least several in the United Kingdom. However, the most common hair color there (as it is worldwide) is brown or black. In fact, you’ll find more people with brown hair in Ireland than red hair. While some assume if your mother or father has red hair, you will too, this is not always the case.<\/p>\n![\"Red](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/red-hair.jpg\")
Redhead woman with freckles. Photo Credit: Victoria Chudinova\/Shutterstock<\/em><\/figcaption><\/figure>\nPeople can have redheads in the family but still not end up with this color. However, if one does have red hair, it is always due to genetics. Red hair comes from a mutation in the melanocortin 1 receptor or MC1R, which is usually passed down from parent to child. Essentially, this causes the body’s skin and hair cells to produce more than one specific type of melanin, as well as less of another. In some cases, the mutation does not affect a child but will still be passed on to their future child.<\/p>\n
<\/p>\n![\"Preauricular](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/preauricular-sinus.jpg\")
Preauricular sinus. Photo Credit: Rumruay\/Shutterstock<\/em><\/figcaption><\/figure>\nPreauricular Sinus<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> 1 to 10% (based on location)<\/em><\/li>\n<\/ul>\n
When you talk about rare genetic traits that most people had no idea about, a preauricular sinus<\/a><\/strong> is likely on the top of that list for people. This is a condition that causes a small hole or dimple to develop on the outer ear. It’ll usually be found at the top of the ear where it connects to the side of the head. For most, it can look like the person had their ear pierced. For others, it can look very different.<\/p>\n![\"Shutterstock](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/shutterstock_2019938327.jpg\")
Preauricular sinus, a small hole in front of the upper side of the ear. Photo Credit: Salman Arif Farooqi\/Shutterstock<\/em><\/figcaption><\/figure>\nOf course, most of the time this is merely a hole in the ear and completely harmless. However, this is still a hole in the ear and that can open a person up for infection a bit more than the average person. The reason you’ve likely never heard of this is probably due to it being incredibly uncommon in the far West as well as most of Europe. Only 1% of people there have it. But in Asia and Africa, roughly 4 to 10% of people have this genetic trait.<\/p>\n
<\/p>\n![\"Marfan](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/marfan-syndrome-stretch.jpg\")
Woman hypermobile hand bending wrist and thumb; Marfan Syndrome. Photo Credit: Pheelings Media\/Shutterstock<\/em><\/figcaption><\/figure>\nMarfan Syndrome<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Just Under 20%<\/em><\/li>\n<\/ul>\n
Marfan Syndrome<\/a><\/strong> can be hard to deal with but it does offer incredible flexibility. This is one of those rare genetic traits that most parents do not want to pass on to their children. The syndrome affects a person’s body tissue where they will be tall and lanky but also have elongated limbs. While being tall and lanky is not so much an issue, the trouble with something like this is what happens on the inside of the body. A person’s heart, eyes, blood vessels, and overall skeleton can be impacted.<\/p>\n![\"Marfan](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/flexible-finger.jpg\")
Marfan Syndrome – Flexible forefinger joint. Photo Credit: JocularHedgehog\/Shutterstock<\/em><\/figcaption><\/figure>\nFor many, their bones will dislocate easily without any major stress to force them to do so. The syndrome also causes extra strain on a person’s aorta and will usually always cause early-onset arthritis. There are some who have a less impactful version of the condition where their ligaments grow long and stretchy to offer hypermobility, but they are otherwise healthy. It is actually a bit more common than some might assume, as 1 in 5,000 people are born with the genetic mutation today.<\/p>\n
<\/p>\n![\"Heart](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2020\/08\/heart-blood-vessels-and-veins-etc..jpg\")
Heart blood vessels, veins & arteries. Photo Credit: Ustas7777777\/Shutterstock<\/em><\/figcaption><\/figure>\nDeficiency In PCSK9<\/strong><\/h2>\n\n- Percentage Of People Who Have It:<\/strong> Around 2%<\/em><\/li>\n<\/ul>\n
While ever wishing to have a major deficiency in normal parts of the body would be a bad thing, it might not be in some specific situations. When it comes to rare genetic traits, one might love to have a deficiency in their Proprotein Convertase Subtilisin\/Kexin Type 9 gene. Otherwise known as the PCSK9 gene<\/a><\/strong>, some people are born with a much smaller amount of this gene than the rest of us.<\/p>\n![\"Heart](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2020\/08\/heart-xray.jpg\")
Heart Location X-Ray. Photo Credit: MDGRPHCS\/Shutterstock<\/em><\/figcaption><\/figure>\nHaving this deficiency can be a blessing in disguise, as it allows a person to have a reduced risk of heart disease by up to as much as 90 percent! On top of this, they do not have to worry about their cholesterol numbers like others. However, this deficiency does come with some drawbacks. The deficiency allows one to have an increased number of cholesterol esters, but this will impact glucose-stimulated insulin secretion. That will cause hyperglycemia and even impaired glucose tolerance.<\/p>\n
<\/p>\n![\"Human](\"https:\/\/dev.sciencesensei.com\/wp-content\/uploads\/2021\/07\/human-body-x-ray.jpg\")
Human joints concept with the skeleton anatomy of the body. Photo Credit: Lightspring\/Shutterstock<\/em><\/figcaption><\/figure>\nUnbreakable Bones<\/strong><\/h2>\n\n
Curly hair<\/a><\/strong> is something a lot of people love, and actually have to fake. They might do this with a curling iron, but the curls they add are small and picked out to fit a specific look. For those with truly curly hair, having the chance to “pick” where their curls show up is nonexistent. It is a great look, but very few people have naturally curly hair. We do not mean small curls when we state this, by the way.<\/p>\n For example, if you do not brush your hair well and have a few curls at the bottom or if your bangs get so long they curl up. We mean people who have most sections of their hair curl on them naturally. These people are pretty rare, funny enough. Curly hair is one of the world’s rare genetic traits because only 11% of the world’s population has it. In fact, there are some people who have siblings with curly hair while they do not, showing just how rare it can be even in the same immediate family.<\/p>\n <\/p>\n We should make sure to reference here that when we state “natural blonde hair,” we mean those that are only blonde. Not those that have brown or black within the hair, aka “dirty blonde” hair. It is widely assumed we have more blonde people in the world than we actually do. “Blonde” is one of the most popular hair colors that people dye their hair to fit. It is stated that three in four caucasian women dye their hair blonde. This is why there are significantly more “bottle blondes<\/a><\/strong>” than natural blondes.<\/p>\n Moreover, natural blonde hair is more common for children than adults. This is due to the fact that hair tends to darken as we age, causing more adults to end up with brown or black hair before going grey or white. It is tough to get a true percentage of adults with this natural color, again due to the mass popularity of dying hair. However, due to the help of hairdressers and truthful people, it has been determined between 2 to 6% of adults have naturally blonde hair in the world today.<\/p>\n <\/p>\n Rare genetic traits like an inverted navel can be really odd to see among adults. However, they are not exactly crazy to see among young children. Children that are newborns all the way up to a few years old may have what is commonly called an “outie belly button.” Of course, the true name for this is an inverted navel, but most people do not know the true medical term for it. Most children who have an inverted naval will eventually see it sink in to look normal.<\/p>\n Although, it can last for others into their teenage years. It does usually go away before that timeframe, but the cases change often depending on the size of the person. While some believe that the naval being inverted or not is determined by how the umbilical cord is cut, this is not the case. How the scar heals there afterward is really the biggest factor. Sometimes, the child might even have a small hernia at birth that causes it too. Today, only 10% of adults<\/a><\/strong> have any form of inverted naval.<\/p>\n <\/p>\n The DEC2 gene is one of the rare genetic traits that many wish they had. People with the DEC2 gene<\/a><\/strong> do not need to sleep as much as a normal person to function at their body’s maximum capacity. Most people need around 8 hours of proper sleep<\/a> per night for them to function properly. Sleep<\/a> is important for the function of our brain and it also helps our bodies heal from numerous issues. Doctors might recommend sleep for people with a cold or flu due to this.<\/p>\n Often called the “no sleep” gene, that is actually a common mistake. People with DEC2 need sleep, but only 4 to 6 hours at the most. Some might say “well I sleep that much so I might have it.” That is not always true. Some people have bad sleep patterns that cause a lack of sleep to occur. Yet these people need more sleep whereas those with DEC2 simply go through their full natural sleep cycle in less time than most. Therefore, they do not need the extra hours others do.<\/p>\n <\/p>\n Most people end up having their wisdom teeth removed before they reach adulthood. Of course, some of these people did not need to remove them. Others were told to do so for the health of their teeth. When they come in, wisdom teeth will grow and push on the rest of your teeth. This can cause pain and even make your teeth crooked at times. Yet people went thousands of years without this problem, what happened? Funny enough, some people are born without them<\/a><\/strong>.<\/p>\n Nearly 100% of all indigenous Mexicans do not have wisdom teeth from birth. Yet nearly all Tasmanian Aborigines do. This presents a situation in which evolution dictated need, causing people in different parts of the world to need or not need wisdom teeth. Due to this, roughly 20% of the planet is now born without wisdom teeth. This used to be rarer than it is today but the percentage is climbing, meaning more will be born without them as we go into the future.<\/p>\n <\/p>\n One of the world’s rare genetic traits that can be quite annoying for people, the photic sneeze reflex<\/a><\/strong> is a condition where light causes someone to sneeze. We do not mean random light, such as one in your kitchen or the light from your television. It is usually only triggered by looking at very bright lights and other various stimuli. The reflex affects everyone who has it differently. Some can handle brighter lights than others, for example. It actually has a more official name, which is quite funny.<\/p>\n That name is Autosomal Dominant Compelling Helio-Ophthalmic Outburst. This is abbreviated as literally ACHOO. We know, we know. Of course, others with a lesser sense of humor also refer to it as “photosneezia.” It’s hard to get an accurate number of people affected by the trait. This is why a wide range of 11 to 35% of the world is said to have it. However, according to the Journal of the American Optometric Association, the majority of those affected by it are actually white females.<\/p>\n <\/p>\n Morton’s Toe<\/a><\/strong> is quite often something that looks weird to everyone who sees it. Most people have five toes on each foot, with the literal “big toe” on both feet. Of course, it is located on the far right of a person’s right foot, while on the far left of a person’s left foot. For most people, the “big toe” is referred to as such because it is the biggest toe on the foot. But for those with Morton’s Toe, that is not the case.<\/p>\n For those people, the “big toe” is actually smaller than their second toe. The look of those with this genetic trait often varies among those with it. For some, it is the same height as their big toe but not as wide. For others, it is just as wide as the big toe. Meanwhile, for others, it is just as tall and wide as the big toe. You might get some who see the second toe grow taller or wider than the big toe as well. Interestingly, the Statue of Liberty in New York actually has the Morton’s Toe genetic trait too.<\/p>\n <\/p>\n Everyone has lines on their hands, but the way those lines look will vary widely among literally everyone. Yet for some, the way their lines look will be very different. For some, there is a rare phenomenon where the letter “X” will be formed on BOTH hands. The writer of this very article actually has this exact genetic trait. For the ancient<\/a> Egyptians and Greeks, there were many meanings behind the “X-Hands.” They used to believe it was a sign of strong character or that a person was destined for greatness.<\/p>\n Of course, “palmistry<\/a>,<\/strong>” or the foretelling of the future using a person’s palms, is complete garbage. It means nothing to have an “X” on your hands. However, it is still one of the world’s rare genetic traits as only 3% of the human population has this. This might differ a bit among our primate friends such as chimps or great apes. To be fair, it made sense to think the “X” meant something as Alexander the Great among other leaders in history had this “X” letter on both hands. Therefore, there “might” be something to it.<\/p>\n <\/p>\n People who have cutaneous horns<\/a><\/strong> were often referred to as devils due to religious groups not grasping scientific phenomenons. This specific condition has been around for centuries, and religious types pounced whenever they saw someone with one or more horns on their body. Referred to as cutaneous horns or cornu cutaneum, the horn or horns a person gets are simply unusual skin tumors.<\/p>\n Basically, these horns can appear pretty much anywhere on a person’s body. They often are seen on the head or face. But they can also come out of the arms or legs too. While most of the horns can be relatively small, there are rare cases where they grow very large. A French woman named Madame Dimanche had a horn that measured out to 10 inches! The good thing is that these horns can be removed today. The way it is done will differ depending on size and how cancerous it is or is not.<\/p>\n <\/p>\n HIV\/AIDS might not be as much of a death sentence as it used to be. Human Immunodeficiency Virus (HIV) itself causes immune system problems. This can cause someone to have trouble fighting off infections or viruses that others might be able to combat just fine. If it is not treated properly, HIV can turn into Acquired Immunodeficiency Syndrome (AIDS). Due to the rise of scientific breakthroughs<\/a> in this field, we are able to keep many people from ever ending up with AIDS if HIV is caught early enough. HIV can pass from person to person via a person’s main bodily fluids, such as their blood or sperm.<\/p>\n Although, women can pass it to men by the man being inside them at all. Sweat and spit, however, will not transfer it. Some have nothing to worry about though, as they are completely resistant to HIV. Those people have a rare genetic mutation called CCR5 Delta 32<\/a><\/strong>. The mutation caused the CCR5 co-receptor to be far smaller than normal, making it difficult for the HIV virus to enter cells. The main receptor is closed, preventing the virus from ever taking hold of a person’s body. Today, scientists are trying to mimic this via stem cells using cells from HIV-immune individuals. Making these people incredibly important.<\/p>\n <\/p>\n Heterochromia<\/a><\/strong> is one of the rare genetic traits a lot of people know about by now. The reason for this is likely due to how obvious it is that a person has it. This is a genetic trait that causes a person to have two different colored eyes. However, those with different colored sections in each eye are also said to have this. In rare cases, a person with this trait might also see a difference in color for other body parts too. This can be a difference in skin color, hair, etc.<\/p>\n All of this comes down to how the genetic mutation works. Our eye color is affected by the melanin in our body. Heterochromia is the result of a mutation that led to an error in the distribution of melanin before a person was born. Of course, the most dramatic and obvious heterochromia cases are those with broadly different eye colors, specifically in the iris. It can be really wild to see but often beautiful. Interestingly, only 1% of the world’s population has any version of heterochromia.<\/p>\n <\/p>\n If you thought having naturally blonde hair as an adult seemed rare, having red hair<\/a><\/strong> is even rarer. Many assume most people from Ireland have red hair, or at least several in the United Kingdom. However, the most common hair color there (as it is worldwide) is brown or black. In fact, you’ll find more people with brown hair in Ireland than red hair. While some assume if your mother or father has red hair, you will too, this is not always the case.<\/p>\n People can have redheads in the family but still not end up with this color. However, if one does have red hair, it is always due to genetics. Red hair comes from a mutation in the melanocortin 1 receptor or MC1R, which is usually passed down from parent to child. Essentially, this causes the body’s skin and hair cells to produce more than one specific type of melanin, as well as less of another. In some cases, the mutation does not affect a child but will still be passed on to their future child.<\/p>\n <\/p>\n When you talk about rare genetic traits that most people had no idea about, a preauricular sinus<\/a><\/strong> is likely on the top of that list for people. This is a condition that causes a small hole or dimple to develop on the outer ear. It’ll usually be found at the top of the ear where it connects to the side of the head. For most, it can look like the person had their ear pierced. For others, it can look very different.<\/p>\n Of course, most of the time this is merely a hole in the ear and completely harmless. However, this is still a hole in the ear and that can open a person up for infection a bit more than the average person. The reason you’ve likely never heard of this is probably due to it being incredibly uncommon in the far West as well as most of Europe. Only 1% of people there have it. But in Asia and Africa, roughly 4 to 10% of people have this genetic trait.<\/p>\n <\/p>\n Marfan Syndrome<\/a><\/strong> can be hard to deal with but it does offer incredible flexibility. This is one of those rare genetic traits that most parents do not want to pass on to their children. The syndrome affects a person’s body tissue where they will be tall and lanky but also have elongated limbs. While being tall and lanky is not so much an issue, the trouble with something like this is what happens on the inside of the body. A person’s heart, eyes, blood vessels, and overall skeleton can be impacted.<\/p>\n For many, their bones will dislocate easily without any major stress to force them to do so. The syndrome also causes extra strain on a person’s aorta and will usually always cause early-onset arthritis. There are some who have a less impactful version of the condition where their ligaments grow long and stretchy to offer hypermobility, but they are otherwise healthy. It is actually a bit more common than some might assume, as 1 in 5,000 people are born with the genetic mutation today.<\/p>\n <\/p>\n While ever wishing to have a major deficiency in normal parts of the body would be a bad thing, it might not be in some specific situations. When it comes to rare genetic traits, one might love to have a deficiency in their Proprotein Convertase Subtilisin\/Kexin Type 9 gene. Otherwise known as the PCSK9 gene<\/a><\/strong>, some people are born with a much smaller amount of this gene than the rest of us.<\/p>\n Having this deficiency can be a blessing in disguise, as it allows a person to have a reduced risk of heart disease by up to as much as 90 percent! On top of this, they do not have to worry about their cholesterol numbers like others. However, this deficiency does come with some drawbacks. The deficiency allows one to have an increased number of cholesterol esters, but this will impact glucose-stimulated insulin secretion. That will cause hyperglycemia and even impaired glucose tolerance.<\/p>\n <\/p>\nNatural Blonde Hair<\/strong><\/h2>\n
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Inverted Navel<\/strong><\/h2>\n
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The DEC2 Gene<\/strong><\/h2>\n
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Born Without Wisdom Teeth<\/strong><\/h2>\n
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Photic Sneeze Reflex<\/strong><\/h2>\n
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Morton’s Toe<\/strong><\/h2>\n
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X-Lines On Hands<\/strong><\/h2>\n
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Cutaneous Horn<\/strong><\/h2>\n
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HIV Resistance Mutation<\/strong><\/h2>\n
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Heterochromia<\/strong><\/h2>\n
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Red Hair<\/strong><\/h2>\n
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Preauricular Sinus<\/strong><\/h2>\n
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Marfan Syndrome<\/strong><\/h2>\n
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Deficiency In PCSK9<\/strong><\/h2>\n
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Unbreakable Bones<\/strong><\/h2>\n
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