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

When isolated groups of humans have to make babies with people who they are related to, they can have babies with people who are not as closely related as a brother or sister. For example, if two cousins wanted to have a baby, that would be less risky than if a brother and sister wanted to have a baby. This means that the baby would still have a chance of getting some of the same genes, but not as many as if the parents were more closely related.