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Fascinating, I never considered the explanation that the parents aren't representative of the general population, especially in regards to R vs K strategy.
My original blogpost, which got me much trouble. I think most of this biracial effect is due to self-selection, yeah. Case in point, my 3 last girlfriends were all genetic foreigners. :p http://emilkirkegaard.dk/en/?p=6618
Agreed entirely with that opening italicized statement, so it's a confusing issue.
And yeah, that makes sense, pretty similar story here 
birds with off-colored feathers flock together?
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