That means that we're all African by descent!
In the final analysis we're all human by race and all else is just environmental modification. Peruvian Indians have well developed lungs for living at high altitudes. Negros are named for their skin adaptation and yellow, white and other adaptations have everyting to do with our planet's multiplicative environment!
I think I remember reading about that great...grandma some years ago. I believe she was referred to as "Eve" if we are talking about the same study. Out of Africa.
Seems like Mark Twain may have referred, speaking as Huckleberry Finn, to the human tendency to make the most of our differences, rather than our areas of common ground. My memory may be faulty there.