That's a kind of open question. You can't select on specific polymorphisms, because intelligence is very polygenic (as are most health conditions). You can sele

That's a kind of open question. You can't select on specific polymorphisms, because intelligence is very polygenic (as are most health conditions). You can select on polygenic scores, which sum up the effects of millions of polymorphisms. The controversial question is whether there might be unknown side effects. Like, what if intelligence is genetically correlated with autism? Overall, my suspicion is that it'll be fine, because you are selecting on (a sum of) many genetic variants that are common in the population already. But I would not be 100% confident of that statement.