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I'd assume that evolution happens quite fast if the trait is already there in the population (people are more or less light-skinned everywhere) and there is suc
by Nitramp 14y ago
I'd assume that evolution happens quite fast if the trait is already there in the population (people are more or less light-skinned everywhere) and there is such a strong selection pressure (much more food available if you can adapt to the lack vitamin D).
- raverbashing 14y agoExactly, it's not evolving lighter skin It's evolving keeping the light skin by neoteny
- dodo53 14y agoThe canonical example of fast human evolution is lactase (the enzyme for digesting lactose and so cow's milk), thought to have spread widely in <10000 years. http://en.wikipedia.org/wiki/Lactase_persistence#Evolutionary_history http://en.wikipedia.org/wiki/Lactase_persistence#Evolutionar...