I might be missing something, but doesn't assortative mating in itself guarantee that certain hereditable characteristics would be more likely to flourish? Als

I might be missing something, but doesn't assortative mating in itself guarantee that certain hereditable characteristics would be more likely to flourish? Also, I thought it was funny that one of the researchers cited (Simon Baron-Cohen) is a cousin of the Baron-Cohen you've probably heard from before, especially since I've long sensed a whiff of spectrum disorder in the whole Ali G/Borat schtick.