(Fig. 1) were originally people with a equipped dark skin and had dark hair.
caused by a genetic mutation then light skin tones and blond and red hair. Since red-blond people also have a lighter skin that is less protected against UV radiation, they have to suffer against dark-skinned people a hundred times higher risk of developing skin cancer. Under the burning sun of Africa must therefore mutations that led to lighter skin and changing the appearance of the original dark-skinned and dark haired people have been slaughtered again and again.
Then began men to leave Africa and migrate to other areas of the world. Areas where the sun no longer seemed so intense. This was the "natural sun protection" of dark skin is no longer so important. This happened about 70,000 and 45,000 years ago. In temperate latitudes a lighter skin was no longer a disadvantage.
(Fig. 2)
Quite the contrary: Fair-skinned people with little sunlight can already produce the essential vitamin D3 when they expose their skin to sunlight. So were the carriers of genes for light skin in Europe and Asia at least as good as say people with darker skin tones.
Source: About pixels. de
1: guest
2: SELFMADE2
0 comments:
Post a Comment