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Dark pigmented people living in high sunlight environments are at an advantage due to the high amounts of melanin produced in their skin. Quarterly Review of Biology. Many genes work together in complex, additive, and non-additive combinations to determine the skin colour of an individual. Human Evolutionary Biology. Previous hypotheses suggested that sunburned nipples impeded breastfeeding, but a slight tan is enough to protect mothers against this issue. Native South Americans and Mesoamericans are also typically considered dark-skinned, ranking similarly to African and Oceanian populations in regards to Ala presence. Scientists originally believed that such shifts in pigmentation occurred relatively slowly.

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Retrieved 10 December Serum folate is broken down by UV radiation or alcohol consumption. Annual Review of Anthropology. There is a correlation between the geographic distribution of UV radiation UVR and the distribution of skin pigmentation around the world. This is not a problem near the equator. however, it can be a problem at higher latitudes.

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The speed of change is also affected by clothing, which tends to slow it down. Evolutionary pigmentation of the skin was caused by ultraviolet radiation of the sun. The American Historical Review. This is attributed as, possibly, due to lower presence of Vitamin D binding agents and thus higher bioavailability in dark-skinned individuals. Outside the tropics UVR has to penetrate through a thicker layer of atmosphere , which results in most of the UVB reflected or destroyed en route. because of this there is less potential for vitamin D biosynthesis in regions far from the equator. Annual Review of Anthropology. Eumelanin is the dominant form of melanin found in human skin.

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Description: Annual Review of Anthropology. American Anthropologist. This is remarkable given that the number of polymorphisms for almost all genes in the human gene pool is greater in African samples than in any other geographic region. Furthermore, folate is essential for fetal growth, organ development, and neural tube development. The more they could forage, more and healthier offspring they could produce, and higher the chance they had to pass on their genes for abundant sweat glands. There are no data or studies that support that sunburn can cause damage so serious that can affect reproductive success. Scientists have long assumed that humans evolved melanin in order to absorb or scatter harmful sun radiation. The term black initially has been applied as a reference to the skin pigmentation of the aborigines of Australia. today it has been embraced by aboriginal activists as a term for shared culture and identity, regardless of skin colour. Relatively dark skin remains among the Inuit and other Arctic populations. Berkeley, Los Angeles, London.
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