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I'm generally a fan of "blurry" definitions where something can qualify as X if it fulfills a few of many criteria. I think trying to create hard rules around blurry areas like race and culture is fool's errand, and Scott does a great job laying out how overly strict definitions can go wrong.
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Notes -
Undoubtedly there is a genetics-related meaning of race, in the sense that there are identifiable genetic markers that discriminate (heh) between people of different racial categories.
I should have made clear in my reply above that I was specifically questioning the implication, in the post I was replying to, that a PCA plot showing distinct racial clusters can rebut 'the old feel-good rhetorical device" that there's more genetic variation within than between. It does not necessarily do this, in the situation where the PCs showing those distinct clusters themselves explain a negligible fraction of overall variation.
But that's fine! Rebutting "more variation within than between" does not seem not necessary for race to have a genetic basis.
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