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The reality is - ethics aside (as bad as that sounds) - genetically engineering babies for intelligence etc. probably wouldn’t work. All of our associations are inextricably and unknowably culture-bound (both wrt to time & place)
Selection pressure times additive heritability of the trait yields response to selection in the trait. Why wouldn't this be true for human intelligence, exactly?
By designer babies & genetic engineering, I mean CRISPR & embryo selection & similar methods in-the-news based on specific identified variants (incl polygenic scores), not eg natural or sexual selection or assortative mating
Embryo selection based on polygenic scores for IQ seems a LOT more feasible than CRISPR for IQ, to be sure. And a lot closer to traditional natural selection in terms of population genetics.
Among the Ache, the rank-ordering you get from IQ tests is about the same as that you get from asking them who's cleverer. But when you think about, their way of life is really just like ours, except for agriculture, literacy, the wheel. and electricity.
Because intelligence is also selective. :)
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