I proposed this as a non-joke explanation a while back. Thread incoming 1/xhttps://twitter.com/mtpollack/status/1275074760070684676 …
Africa has all kinds of genetic variation because the species of human there has a longer history there - it doesn't have more phenotypic variation
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And that longer history is what creates diversity.
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Sure, on non-coding DNA which is irrelevant. Obviously selection is more important because it's for traits under selective pressure.
End of conversation
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