West Hunter: Greg Cochran And Henry Harpending Now Have A Blog
September 23, 2011, 11:29 PM
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Cochran explains how Out of Africa can be mostly right at the same time that the old multiregionalists were also right that there really are regional patterns that go back before anatomically modern humans (AMH):
I see three reasons why the modern races split along the same lines as those older , much more divergent groups.  First, the geographical and ecological factors that drove isolation before the expansion of AMH did so again after mostly-modern humans spread over the world.  Second,  those mostly-AMH populations were exposed to many of the same selective pressures as their predecessors, so you expect a certain amount of convergent evolution. Third,  there is reason to believe  that those moderns picked up adaptive alleles from the archaic populations they displaced – so, to a limited extent, they are the the old subspecies.