The infamous Steve Sailer has written a lot about cousin marriage , which, in practice, seems to be correlated with arranged marriage in many cultures (including the European royals in past centuries). Perhaps a lot of arranged marriages in practice may lead to inbreeding, with the genetic dangers that follow.
I’m also wondering about the effects of anonymous sperm banks, where relatively well-off women may pay to choose a biological father on the basis of—whatever available information they may choose to consider. What factors, in a man they will never meet, do they choose for their offspring?
Personally, I’m desperately hoping for a near-term Gattaca solution, by which ordinary or defective parents can, by genetic engineering, cheaply optimize their children’s tendencies towards all good things, at least as determined by genotype, including ethical behavior and competence, in one generation. Screw this grossly inefficient and natural selection nonsense.
I know the movie presented this as a dystopia, in which the elite were apparently chosen mostly to be tall and good-looking. Ethan Hawke’s character, born naturally, was short and was supposedly ugly. Only in the movies, Ethan. But he had gumption and grit and character, which (in the movie) had no genetic component, enabling him to beat out all his supposed superiors. I call shenanigans on that philosophy. I suspect that gumption and grit and character do have a genetic component, which I would wish my own descendants to have.