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European nations established only from Medieval times - whites are very new to Europe
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[QUOTE]Originally posted by rasol: [QB] [QUOTE]Originally posted by Knowledgeiskey718: [qb] Lmao, still with the Inuits I see. [b]The only way Inuits retain melanin is through consumption of a rich Vitamin D diet. Which is why if Inuits stop consuming this diet, develop rickets. ---Fact [/b] [b]Fact:[/b] Everyone comes from Africa. Including Europeans, Asians, Oceanic's etc... [b]Fact:[/b]Pale skin of East Asians and Europeans occurred independently and separately from eachother. Meaning not at the same time. Meaning East Asians didn't come from African albinos and neither did Europeans. Meaning Europeans pale skin didn't come from Asians, nor vice versa. The genes were independently evolved in both populations. Except for Africans, Africans don't have these mutations as East Asians and Europeans do. [b]Fact:[/b]Man evolved in the hot African sun as black, to be able to protect themselves from the harmful UV rays, man walked OOA(Out Of Africa) black, as we can see from Oceanic's(Australians, Melanesians etc..). But when humans move into northern latitudes without the intense sunrays, darkskin is a disadvantage since it blocks out the ability to synthesize UV. Under lower UV environments skin has to be lighter to be able to let in UV to allow production of Vitamin through synthesis. This is what pale skin evolved for. [b]Fact:[/b] Pale skin doesn't have to evolve if there is enough Vitamin D in ones diet to allow the melanin levels to stay strong. Clear example of a human population retaining pigmentation under harsh low UV environments are Eskimos. [b]Fact:[/b]Results reveal a clear tendency for the EUP sample to cluster with recent Africans, while LUP and MES samples cluster with recent Europeans. Meaning during early upper paleolithic Europeans were still tropically adapted, but by the late upper paleolithic, Europeans were already becoming cold adapted. [QUOTE]Originally Posted by Knowledgeiskey: Allow me to explain this is "laymen" terms. You're clearly speaking upon the pale phenotype of East Asians and Europeans (since you should already know cranio-facially/phenotypically speaking, Africa pretty much covers the world, I won't go into details on that) . This evolution/mutation is a recent adaptation, considering an evolutionary time line. [b]This occurred due to the fact when humans move into northern latitudes need to be lighter skinned in order to allow UV in to produce Vitamin D(since dark skin was evolved to protect from harmful UV, therefore it prevents from absorbing UV to produce Vitamin D). [/b] Early humans as well as early Europeans were hunter gatherers, in a hunter gatherers diet you will find food which contains adequate amounts of Vitamin D, through fish, meats, egg yolks etc... Absorbing enough of this Vitamin D will provide humans with enough Vitamin D to keep their skin dark with no need to be pale, since their receiving the Vitamin D through their diets. [b]A clear example of a human population which consumes adequate amounts of vitamin d and retains melanin, are Eskimos. If you do some research you will notice that an Eskimos diet consists of rich amounts of Vitamin D, and if they would stop eating this diet, Eskimos would develop Vitamin D deficiencies, which surface as rickets, the reason for this is as explained, when humans move to northern latitudes/lower uv environments they aren't receiving as much sun(obviously) and since dark skin protects from harmful UV rays, it blocks out the ability to produce synthesize UV.[/b] The sun is one main source of Vitamin D along with diet. So in northern latitudes under a farmers diet(which doesn't provide an individual with adequate amounts of Vitamin D as a hunter gatherers diet would) humans would have to be lighter skinned, as explained, to allow the synthesis of UV for the production of Vitamin D, since dark skin blocks out the sun Therefore, as explained light skin was evolved to allow the synthesis of Uv for the production of Vitamin d, but remember early Europeans were hunter gatherers, just as Eskimos are/were, so early Europeans retained their melanin levels as well, until agriculture spread. But agriculture /farming didn't spread into Europe until about 8kya with the Neolitic revolution. This new way of living decreased Europeans intake of vitamin D, since a farmers diet is not full with the adequate amounts of Vitamin D that a hunter gatherers fisher/herders diet consists of. Therefore during this era, Europeans and East Asians evolved pale skin to allow UV in to produce Vitamin D through synthesis. [/QUOTE][/qb][/QUOTE]Very good. I would add: Independant development of lighter skin is called covergent evolution. Covergence is generally considered evidence of adaptation. The potential for variation in skin color with variations in solar radiation, was established in Africa with the early migration of humans into temperate [southern] latitudes. As with other features - non Africans are developed upon an African genetic background. IE - European pale skin, is based on original African genes for dark skin, and heavily modified, actually effectively disabled by recent mutation. Dark skinned non Africans - from Australia to Pacific Islands not *only* have dark skin, but ancient genes devoid of recent mutations found in -all- leucoderms. They are Blacks because their ancestors were - all humans are descendant from Equatorial Africans, all of whom were Black. Even the lighter skinned Blacks of parts of Southern Africa have skin color genes -derived from- the skin color genes of darker Blacks. This variation itself is proof of the environmental basis for skin color variation. If there is no -downside- for vitamin synthesis due to high melanin levels, then there is no reason for African skin color to vary. Indeed, there is no reason for tanning at all. Everyone would be blue black, and stay that way. ^ These facts are reiterrated for anyone who missed them the 1st few dozen times. :) [/QB][/QUOTE]
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