if the first human evidance was found in africa how come people have different colour skin ???

Question

i tink i herd it was either africa or aisa

Answer 1

Dark skin worked well for a very long time until humans started expanding to the northlands where the sun doesn't shine very much in winter.

People with dark skin are not able to absorb vitamin D from the sun as easily as lighter skinned people. Thus, when they encountered the northern winters with less sun, the lighter skinned people prospered and produced ever more people with ever lighter skin.

Answer 2

Skin color is designated by a pigment called Melanin and comes in two variants, Pheomelanin and Eumelanin. I beleive Pheomelanin controls red, while Eumelanin controls the darker colors (brown, black, etc).

I believe amounts of each of these is controlled by about 6 genes which practice incomplete dominance.

Scientists believe it happened like this: The first primates and humans had white skin under their hair, but once they begain to lose their hair, they developed darker skin to cope with the increasing sunlight in Africa. When humans moved to less sun-rich area's they became less exposed to high intensity sunlight and no longer needed their darker skin color.

I hope this helped.

Answer 3

Evolution

Answer 4

Those people were near the equator...look at people in the u.k...pale!