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itsunder9000 comments on Reason as memetic immune disorder - Less Wrong
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I don't think you understand Watson's point of view.
If I understand Watson correctly, he thinks the evidence suggests that the average IQ of native Africans is below 100. He didn't say that all Africans have IQs below 100. I don't know why you think he'd care that he's descended from a black person. Presumably he thinks a substantial minority of Africans still have higher IQs than 100, so if he really cares about the IQ of his black ancestor, it's still plausible that s/he had a high IQ.
But why would anyone care about the IQ of their ancestors? Even if you do think there are racial cognitive differences, there are better ways to measure your own IQ than to guess based on the race of your ancestors.
Why? To have a reasonable measure for the intelligence of their children.
Heard of regression to the mean? An unusually smart person from a background of dumb hick proles, is not going to have kids nearly as smart as they are.
People understand this at a genetic level when picking out mates. "Meet the family" before you decide to keep the girl/guy.