Thinking Mouse: Its all Contingent on Africans having more genetic variance (that probably have less to do with physical traits as they all look the same) but less phenotypic variance than non-Africans. But with the existence of Bantus, Pygmies and Khoisans maybe what i said is irrelevant, or not.
- 1. Negroids (Bantus and many others including Nilotics)
- 2. Pygmies
- 3. Khoisan
- 4. Horners (barely even Africans technically halfway between Africans and Caucasians)
Pygmies are very ancient. Their genetic line appears to go back as long as 40-60,000 YBP. The Khoisan genetic line goes back 53,000 years and some think traces of it go back 93,000 years. The Negroids with whom we are most familiar as almost all Blacks you meet in the West are Negroid are a recent race.
The genetic variance within Africans is incredible. Keep in mind that there were forty huge genetic groups in Africa when they Out of Africa people left 70,000 YBP. All of the rest of us are related to only those two groups. Within the 40 existing groups, the genetic variance was immense. The remaining 38 huge genetic groups went on to become modern Africans.
I have been told that there is more genetic difference between two Nigerian tribes 25 miles away than between an Englishman and an Aborigine. If that is true then that is pretty incredible.