The issue with something like CRISPR is that it is inheritable. Not "inheritable and may eventually die out" inheritable, but "inheritable and all future gener

The issue with something like CRISPR is that it is inheritable. Not "inheritable and may eventually die out" inheritable, but "inheritable and all future generations from that point on would have it" inheritable. Usually, a genetic change in one organism takes a long time to spread through a population. But in this case, we have what is called a 'gene drive', where the trait can rapidly spread after a number of generations. http://www.genetics.org/content/201/2/425.full http://www.genetics.org/content/201/2/425.full Any mistake will persist in the population even against selection pressure.