If humans originated in Africa, how can we have anything other than 100% African DNA?

Question

is there some sort of cutoff point where scientists decided “everyone in Ireland 100,000 years ago will be considered 100% Irish”?

In: 12

Answer 1

Depending on definitions we do. It is just unhelpful information so it is rarely talked about this way, except when talking about the origins of humanity. The evidence is that all the non-African diversity in humans nests within the clade of African diversity. Basically everyone outside of Africa can trace their ancestry to a group that is only a small subset of African diversity.