Original sentence: According to the study all non-African populations are more closely related to each other than to Africans.As the genetic distance from Africa to Europe (16.6) is shorter than the genetic distance from Africa to East Asia (20.6) Cavalli-Sforza proposes that both Asian and African populations contributed to the settlement of Europe which began 40 000 years ago.Europe has a genetic variation in general about three times less than that of other continents.Europeans are most closely related to East Asians and least related to Africans.The overall contributions from Asia and Africa were estimated to be around two-thirds and one-third, respectively
Edited sentence: According to the study all non African populations are more closely related to each other than to Africans.Cavalli contends that if evolution of the races had proceeded independently without race mixing then the minimum genetic distance to Africa should at least be 24.7 as with Australia.Cavalli contends that the only reason for this short distance is significant gene exchange between Africa and Europe.The most striking discovery is that the shortest genetic distance from Africa is to Europe at 16.6.This is consistent with the view that all non-Africans are descended from a single population that lived in Africa.This is counterintuitive since blacks and whites have the most divergent skin colors.What is interesting is the two most genetically divergent groups are those that are defined as Black, that is Africans and Oceanians with a genetic distance of 24.7