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humanodon  ·  4016 days ago  ·  link  ·    ·  parent  ·  post: How Can A White Supremacist Be 14 Percent Sub-Saharan African? : Code Switch : NPR

    There was an immense bottleneck that took place when modern humans finally left Africa (the result is that >90% of modern human genetic variation is in Africa).

I have heard and read something to this effect in a variety of sources, but each time the source posited a different cause. It has been a while though, so I wonder if there has been any progress in determining what the likely may be; in your opinion, what is the most likely cause for the bottleneck?