I proposed this as a non-joke explanation a while back. Thread incoming 1/xhttps://twitter.com/mtpollack/status/1275074760070684676 …
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Replying to @CovfefeAnon
Populations within a continent can isolate/become isolated from each other and undergo different selective pressures.
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Replying to @JoeySiskjoey
Yup - but if they got to wherever, others can follow (unless the journey was extraordinary) meaning that genes are going to flow back and forth as the borders get pushed on both sides. Without that one side is going to evolve an advantage for conquest and will exploit it.
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Replying to @CovfefeAnon
That makes sense. I dont know anything about how prehistoric populations would migrate. My main concern was the continent terminology given that africa has within it greater genetic variability than all humans outside of africa for instance.
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Replying to @JoeySiskjoey
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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Replying to @CovfefeAnon
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.
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