This is what happens with incest SoSick. It's why incest isn't a good idea in higher-order species that require a larger gene pool, and why species are generally averse to it. Russ' post seems to be trying to say that no diseases existed when people were "created" and so sisters and brothers could marry each other -- it's a creationist attempt at explaining how a genetic bottleneck of 2 people could recover without the damage to the gene pool that incest creates. He knows these problems exist and saying that they didn't exist in the beginning is a way around them. He also keeps claiming that all mutations are harmful and that junk DNA causes a species to degenerate, which is the main point I was refuting.