Whites evolved from blacks who migrated further north or south from Africa where darker more UV-resistent skin was needed. As they moved into areas with less intense UV radiation they gradually lost it for whatever they did need.
that theory has been debunked by the mapping of the human Genome, Mitochondrial DNA and Y-chromosomes.
A very recent paper on Y-chromosomes published in 2012, (
Re-Examing the "Out of Africa" Theory and the Origin of Europeoids (Caucasians) in the Light of DNA Genealogy written by Anatole A. Klyosov and Igor L. Rozhanski) only confirms the denial of any African ancestry in non-Africans, and strongly supports the existence of a "common ancestor" who "would not necessarily be in Africa. In fact, it was never proven that he lived in Africa."
Central to results of this extensive examination of haplogroups (7,556) was the absence of any African genes. So lacking was the sampling of African genetic involvement, the researchers stated in their introduction that, "the finding that the Europeoid haplogroups did not descend from "African" haplogroups A or B is supported by the fact that bearers of the Europeoid, as well as all non-African groups do not carry either SNI's M91, P97, M31, P82, M23, M114, P262".
With the haplogroups not present in any African genes and an absence of dozens of African genetic markers, it is very difficult nigh on impossible to sustain any link to Africa. The researchers are adamant that their extensive study "offers evidence to re-examine the validity of the Out-of-Africa concept".
They see no genetic proof substantiating an African precedence in the
Homo sapien tree, and maintain that "a more plausible interpretation might have been that both current Africans and non-Africans descended separately from a more ancient common ancestor, thus forming a proverbial fork".
