Yes, I've read that the African race is the most genetically diverse. However, we probably should make a distinction between Africans and African-Americans. My own child is half-white (more-or-less, from my contribution) and half-black (or thereabouts, from his mother's). He is considered "black" in this culture, but that's not a very precise definition in terms of genetics. We have to be very careful not to project modern thinking on race (and I'm sure I have been guilty of it myself) to the ancient royal family. Perhaps it is better not to think about it all until science can be more helpful in sorting things out. In the mean time, there are certainly much bigger issues of interpretation when it comes to ancient history.
© Charles N. Pope, US Library of Congress. All rights reserved.