Even if high IQ outliers breed with other high IQ outliers a quarter of their kids will get both recessive dumb genes, and bring down the average.
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Replying to @Alrenous @gcochran99 and
That's all wrapped up in the narrow-sense heritability. And if it's high - which it is - then non-additivity due to dominance effects is unimportant.
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Replying to @arguablywrong @brettolsen8 and
At least some of what you're calling luck is also genetics.
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Replying to @Alrenous @gcochran99 and
We have estimates of both narrow and broad-sense heritability for intelligence. There is no good evidence for a significantly larger broad-sense heritability. Therefore, dominance effects are negligible.
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Replying to @arguablywrong @brettolsen8 and
Sounds illogical I bet on that being overturned.
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There's no genetic ceiling.
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Pick a set od individuals has unusually high ( or low) value of a trait. Their offspring will still have unusually high ( or low) values, but not as much [regression to the mean]. There's no further regression in later generations: the average has changed.
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Regression happens due to the nonadditive genetic effects not breeding true (because sexual reproduction shuffles alleles around). In generation 2, the additive mean has changed the way the breeders equation says, hence no more regression.
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