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[quote=Anonymous][quote=Anonymous][i]The study, published in the journal PLoS Genetics, was led by Reich and doctoral student Priya Moorjani. Nick Patterson, a research scientist who works in Reich’s lab and at the Broad Institute of Harvard and MIT, worked with Moorjani to develop an additional technique —which they called ROLLOFF — for estimating the dates of population mixture events.

Together with other contributing researchers, the three determined that southern Europeans bear an average of 1 to 3 percent African ancestry dating back about 55 generations. Groups in the eastern Mediterranean’s Levant region have between 4 and 15 percent African ancestry, with an average mixture date of 32 generations ago, while Jewish populations have between 3 percent and 5 percent African ancestry, dating back on average about 72 generations ago. No African ancestry was found in northern European populations.[/i][/quote]

Give us a link, please. Because what you are suggesting is preposterous. Northern Europeans did not spontaneously generate from the north. They and all humans descended (no matter if more  than 77+ generations ago) from Africans. The 3% of "ancestry" you are quoting is a vague misrepresentation of the fact that the concept of "race" is void of biological foundation. Differences are purely superficial.
[b]"The data for tracking lineages come from genomics, DNA comparisons and the study of genetic markers. Tattersall and DeSalle argue that not only are the differences between the classically defined “races” very superficial, they are also of surprisingly recent origin; the variety of human populations seems to have both accumulated and begun to reintegrate within the past 50,000 to 60,000 years. The diversity among us has arisen in a blink of evolution’s eye. The process of relative geographic isolation of local populations into what might have been true races (genetically differentiated populations) during the last Ice Age began to reverse as formerly isolated human groups came back into contact and interbred. That reintegration, which has occurred intermittently throughout human history, is sped up today because of great migration and widespread mating of individuals from disparate geographic origins. The result is that individuals identified as belonging to one “race,” based on the small number of visible characters used in historical race definitions, are likely to have diverse ancestry. The distinction between ancestry and race has important implications, as the authors discuss."[/b]
http://www.councilforresponsiblegenetics.org/Help/Books.aspx[/quote]

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