I wonder if it would really play out that way. I was surprised just how many personality traits were apparently genetic when I learned about the "lost identical

I wonder if it would really play out that way. I was surprised just how many personality traits were apparently genetic when I learned about the "lost identical twin" cases. Only the children who received their genes from their "selfish" parents will make it to the next generation, so I wonder how sustainable a down-trending population will be in the long run.