Not only is there direct experimental evidence for a genetic component to racial differences in
intelligence, there is also the fact that black Americans, who inhabit about the best environment available (and average 17–18% white ancestry, according to molecular anthropologists) have an average IQ no more than 85, still one standard deviation below the white average (the so-called IQ gap). It may actually be as low as 78, since black people with the lowest IQs may be under-represented in many samples.
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