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Anonymous
2016-06-26 19:58:09 Post No. 61350439
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Anonymous
2016-06-26 19:58:09
Post No. 61350439
[Report]
>Natural lighter hair colors occur most often in Europe and less frequently in other areas.[24] In Northern European populations, the occurrence of blond hair is very frequent. The hair color gene MC1R has at least seven variants in Europe giving the continent a wide range of hair and eye shades. Based on recent genetic research carried out at three Japanese universities, the date of the genetic mutation that resulted in blond hair in Europe has been isolated to about 11,000 years ago during the last ice age.
A typical explanation found in the scientific literature for the evolution of light hair is related to the requirement for vitamin D synthesis and northern Europe's seasonal less solar radiation.Lighter skin is due to a low concentration in pigmentation, thus allowing more sunlight to trigger the production of vitamin D. In this way, high frequencies of light hair in northern latitudes are a result of the light skin adaptation to lower levels of solar radiation, which reduces the prevalence of rickets caused by vitamin D deficiency. The darker pigmentation at higher latitudes in certain ethnic groups such as the Inuit is explained by a greater proportion of seafood in their diet and by the climate which the Eskimos live in, because in the polar climate there is more ice or snow on the ground, and this reflects the solar radiation on to the skin, making this environment lack the conditions for the person have blond, walnut or red hair, light skin and blue, gray or green eyes. This required condition in climates which have ice on the ground and places that are located in a region which has much or extreme amounts of solar radiation is commonly known as "escape the sun".
