The claim ...
Most of the genetic diversity in humans is in Africa
... is quite common. On Biology.SE, it is easy to find posts that make this claim. Consider for example:
- Do humans have enough biological differences to be grouped into races or subspecies?
- How do we know the human species arose in Africa?
- What is the correct classification of population groups of homo sapiens?
- Is the claim true?
- What fraction of the total genetic diversity is present in Africa?
I understand that the term genetic diversity is often used in a vague sense. Please make sure to explain what statistics has been considered in the study you would refer to when giving estimates of what fraction of the genetic diversity is found in Africa. Note that I am not asking "why is it true?" but only "is it true"?