Black hair
This article possibly contains original research. (October 2020) |
Black hair is the darkest and most common of all
Distribution
Black hair is the most common in
Hair is naturally reflective, so black hair is not completely dark in bright light. However, the darkest shade will not have a warm, neutral tone but a sheen which can seem almost blue, like the iridescence of a raven's wing; hence, sometimes referred to as raven-black.[citation needed] Jet black hair appears to have reflective silver color in bright sunlight.[citation needed]
Genetics
11,000-year-old remains of Cuncaicha and Lauricocha individuals from South America share alleles at the highest rate with present-day Amerindians, indicating that the derived G-allele increased in frequency in parallel with the ancestral A-allele.[11]
One of the most studied genes that produce brown hair is MC1R, which helps the body to produce the melanocortin protein. This protein in turn helps the body's hair follicles to produce the type of melanin called eumelanin. To have black hair, one must have genetically inherited this gene from both of their parents, and brown hair is achieved when it is inherited from one parent. This gene is demographically common, as 90% of the total world population carries this gene. Black hair, along with brown hair, comes to turn grey in old age as the hair follicles can no longer produce the pigmentation, but the cause of this inability has yet to be determined.[12]
Gallery
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Chinese girl with black hair.
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Native American with black hair from South America.
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Native American with black hair from North America
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Native American with black hair from South America
See also
References
- ^ "Is hair color determined by genetics?: MedlinePlus Genetics". medlineplus.gov. Retrieved 2022-11-17.
- ^ Goodley, Alvin (2019-10-18). "4 Rarest Hair Colors in the World". Archived from the original on 2020-08-06.
- ^ The Distribution of Anthropological Traits in Europe, Bertil Lundman: The Races and Peoples of Europe (New York 1977)
- ISBN 9780806350271.
- PMID 32425573.
- S2CID 39460005.
- ^ "Why do people of African descent have a unique hair texture?". The Tech Interactive. 2021-12-23. Retrieved 2022-11-17.
- ^ "Native Americans and Asians carry a version of the EDAR gene that is linked to thicker hair shafts". 23 April 2018.
- PMID 23415220.
- PMID 29686092.
- PMID 30415837.
- ^ "Is hair color determined by genetics?: MedlinePlus Genetics". medlineplus.gov. Retrieved 2022-11-17.
External links
Media related to Black hair at Wikimedia Commons