People of East Asian, Southeast Asian, South Asian, and Indigenous American descent commonly have straight black hair, a trait linked to the EDAR gene, while some people of African descent, particularly in North and East Africa, can also have straight or wavy hair, though curly/coiled hair is more prevalent.
Black hair is actually one of the least common colors. Black hair is only naturally found in people of any Asian ancestry (but especially East Asian and South Asian) and Native American ancestry, and even then, many of those people still do not have black hair, they have brown or dark brown hair.
Yes, whether a hair is straight or curly is genetic separate from the other phenotypical attributes of an African-American. An African-American can be blonde, straight hair with blue eyes. All it takes to be black is to have a black ancestor, the one drop rule.
Summary: Populations with East Asian and many Native American ancestry exhibit the highest prevalence of very straight hair, driven largely by the EDAR allele and other genetic variants, with considerable individual and regional variation.
Black hair is caused by having a lot of melanin in the hair – melanin absorbs UV light so it doesn't harm our cells. In Asian groups where the amount of sunlight was high, black hair was a good adaptation because it meant that more harmful UV light from the sun would be absorbed.
Mechanical properties vary among different ethnicities. Asian hair demonstrates the highest hardness and elastic modulus, followed by Caucasian and African hairs, respectively.
Red is the rarest hair color, but to understand why that's the case, you need a basic grasp of the science. There's a lot more to it than the simple traits we learned about in high school biology.
The rarest hair type is generally considered Type 1A, which is extremely fine, straight, and wispy, lacking any natural bends or waves, making it difficult to hold a curl but naturally sleek and prone to oiliness. While curly hair types (Type 3 & 4) are less common globally, 1A stands out as the least voluminous and textured straight hair, often seen in people of East Asian descent, though it's considered rare across all populations due to its unique fineness.
Specifically, the relevant findings indicate that the EDAR mutation coding for the predominant East Asian 'coarse' or thick, straight hair texture arose within the past ≈65,000 years, which is a time frame that covers from the earliest of the 'Out of Africa' migrations up to now.
Hair growth rates also vary between hair races. Caucasian hair grows at a rate of about 1.2cm a month and has the greatest density of all three hair types. Blondes have about 146,000 hairs on their heads, black-haired beauties about 110,000 hairs, brunettes 100,000 hairs and redheads roughly 86,000 hairs.
Type 1A hair is the rarest of them all. Straight as a pin and can be prone to greasiness. It can be difficult to style, is extremely fine and it does not hold a curl.
The highest prevalence of straight or wavy hair was in China (86.6%) and Japan (84.3%).
The most studied black hair gene is MC1R which causes the body to produce a protein called melanocortin. This protein causes hair follicles to produce a type of melanin pigmentation called eumelanin. Black hair has the highest concentration of this pigmentation with brown, blonde and red hair following behind.
Black: Earth's Dominant Crown Venture into any bustling metropolis or remote village, and you'll find that black hair reigns supreme. Approximately 75-85% of the global population sports this commanding colour, with its highest concentration in Asia, Africa, and South America.
Across populations. In 1876, Oscar Peschel wrote that North Asiatic Mongols, Native Americans, Malays, Hottentots and Bushmen have little to no body hair, while Semitic peoples, Indo-Europeans, and Southern Europeans (especially the Portuguese and Spanish) have extensive body hair.
Indian human hair comes in a variety of natural colors, from black to dark brown and every shade in between. Because virgin hair is never colored and sold in its natural state, hence the name virgin hair, slight color variations between hair bundles may exist.
"Black-haired people of Amerindian, East Asian, Southeast Asian, Far East Russia, South Asian ancestry )and some people of the Middle East( have thicker and straighter hair due to the Derived EDAR gene allele that is linked to thicker and straighter hair and shovel-shaped incisors.
Hair morphology is one of the more conspicuous features of human variation and is particularly diverse among people of European ancestry, for which around 45% of individuals have straight hair, 40% have wavy hair, and 15% have curly hair.
Our hair loss is thought to have happened well before modern humans migrated north of Africa. So body balding would also have allowed our ancestors to better control body temperature in hotter climes. You may need a coat sometimes, but at least you don't have to carry it around all year long.
In straight type, thin hair was judged most attractive, whereas in wavy type, hair with mean diameter received the highest attractiveness judgments. In conclusion, there was considerable variation in age, health and attractiveness perception of hair with regard to effects of hair diameter, type, and color.
Long scalp hair is likely to have evolved first as long, tightly curled hair for better thermoregulation and was further selected at a later point in human evolution owing to its unique social communication functions.
The rarest eye colors are often cited as violet/red (due to albinism or light scattering) and green, found in only about 2% of the global population, though some sources also put grey or heterochromia (different colored eyes) as extremely rare, often less than 1%. While green is the rarest natural pigment-based color, truly unique shades like violet (often an optical effect with albinism) and conditions like heterochromia are exceptionally uncommon.
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