Inbreeding, recessive gene disorders and the origin of our species: how come we didn’t die out?

Question

Or any other species for that matter?

In:

Answer 1

Recessive gene disorders take generations to show up. When that first pair with the beneficial mutation that will set them on the path to a new species start in the niche, they have it all to themselves. They exploit that niche by having many offspring. Sure, their offspring interbreed, but that gives you an expanding pool of individuals in the same place. Bad pairs will happen, and those genes will die out, but an open niche gives lots of opportunities.

It’s not like what you see in endangered species today. Those sspecies see some other pressure, mostly habitat loss, that makes it hard for their population to explode as it would in an open niche.