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The indigenous Papuan people of New Guinea have dark skin pigmentation and have inhabited the island for at least 40, years. Retrieved 10 October Cambridge University Press. As a consequence there are many health implications that are the product of population movements of humans of certain skin pigmentation to new environments with different levels of UVR. Melanin is derivative of the amino acid tyrosine. University of California Press. Retrieved 4 July

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Darkly pigmented people tend to exhibit less signs of aging in their skin than the lightly pigmented because their dark skin protects them from most photoaging. Because it is impractical to wear extensive clothing in a watery environment culture and technology does little to buffer UVR exposure. The primary factor contributing to the evolution of dark skin pigmentation was the breakdown of folate in reaction to ultraviolet radiation . the relationship between folate breakdown induced by ultraviolet radiation and reduced fitness as a failure of normal embryogenesis and spermatogenesis led to the selection of dark skin pigmentation. Linus Pauling Institute. Furthermore, folate is essential for fetal growth, organ development, and neural tube development. Balding, Chris Tyler-Smith 21 June Darkly pigmented, eumelanin-rich skin protects against DNA damage caused by the sunlight.

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British Journal of Dermatology. The loss of body hair led to the development of dark skin pigmentation, which acted as a mechanism of natural selection against folate depletion, and to a lesser extent, DNA damage. Journal of Human Evolution. This hypothesis is not consistent with the evidence that most of the hominid evolution took place in savanna environment and not in tropical rainforests.

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Description: The native people of Bougainville, Papua New Guinea, have some of the darkest skin pigmentation in the world. Due to their similar phenotype and the location of New Guinea being in the migration route taken by Indigenous Australians, it was generally believed that Papuans and Aboriginal Australians shared a common origin. Retrieved 5 November Journal of Public Health. It is known that dark-skinned people who have moved to climates of limited sunlight can develop vitamin D related conditions such as rickets , and different forms of cancer. This hypothesis is not consistent with the evidence that most of the hominid evolution took place in savanna environment and not in tropical rainforests. Dark-skinned people who live in high latitudes with mild sunlight are at an increased risk — especially in the winter — of vitamin D deficiency. For example, Wilson et al. At times, individuals with more sweat glands were born.
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