if procreating with close relatives causes dangerous mutations and increased risks of disease, how did isolated groups of humans deal with it?

Question

if procreating with close relatives causes dangerous mutations and increased risks of disease, how did isolated groups of humans deal with it?

In: 562

Answer 1

By getting more diseases and dying from it.

An increased chance of genetic disorders doesn’t mean that the entire population will become extinct. It simply means that some individuals in that population will have a smaller chance of survival.