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OrphanWilde comments on Suppose HBD is True - Less Wrong
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Not quite. You are thinking of breeding people to develop a trait (in this case, intelligence) and are correct that you want diversity in your breeding stock. However what that diversity gets you is not just top-end results. It gets you variance -- basically, you'll get a few geniuses and a lot of idiots.
In animal breeding that's not a issue -- you kill off (or prevent from breeding) all the failures and just keep the very few top results. For humans that would be... problematic.
So if you encourage greater variance in outcomes and you keep all of them, the question becomes who breeds faster: idiots or geniuses. Let me point out that I'm not optimistic about that question.
By the way, empirically people with both black and white ancestry have average IQs between the pure blacks and the pure whites. This seems to indicate that you don't get much by cross-breeding.
Not quite. It depends on who the mother is, and who the father is.
But I'm suggesting something slightly different: To the extent we engage in eugenics to improve our genetic lineage, we should be pulling genetics from every stock.
But we don't and are not very likely to start in the near future.
Genetic modification isn't that far away, and in some respects with regard to some conditions genetic culling of reproductive cells is already here. Both are forms of eugenics.
Direct genetic modification CRISPR-style doesn't require any cross-breeding, you just insert the genes you like and delete the ones you dislike.
In any case, this has little to do with the usefulness of HBD claims.