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DNA from 4,500-year-old Ethiopian reveals surprise about ancestry of Africans
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[QUOTE]Originally posted by Troll Patrol # Ish Gebor: [QB] Brenna Henn, in this 2014 interview on population genetics and population structure, considering African populations. “African populations have the most genetic diversity in the world,” Henn said.“If you compared people from the Kalahari Desert to people from Mali, they’d be as different from each other [genetically] as Italians and Chinese people.” Why are other populations of humans so much less genetically varied than Africans? The answer, Henn explains, lies in our ancestors’ history; the groups of people that migrated out of Africa and spread throughout other continents were smaller subsets of that original, genetically diverse population. [b]"AND WITHIN EACH OF THESE GROUPS THERE IS AN AMAZING AMOUNT OF DIVERSITY,[...] THE DIVERSITY IS INDIGNIOUS TO AFRICAN POPULATIONS":[/b] Tracing Family Trees, And Human History, With Genetics http://youtu.be/Pjf0qKdzmrc [QUOTE] [...] [IMG]http://www.pnas.org/content/109/44/17758/F2.medium.gif[/IMG] [b]Fig. 2.[/b] Schematic of a serial found effect. We illustrate the effect of serial founder events on genetic diversity in the context of the OOA expansion. Colored dots indicate genetic diversity. Each new group outside of Africa represents a sampling of the genetic diversity present in its founder population. The ancestral population in Africa was sufficiently large to build up and retain substantial genetic diversity. The third assumption is that there have been no dramatic postexpansion bottlenecks that differentially affected populations from which the serial migration began. If the source population for the expansion suffered a severe bottleneck that reduced its genetic diversity, we should see a poorer linear fit to the decline of heterozygosity with distance from Africa, or erroneously assign a population with higher genetic diversity as the source population. It is this third assumption we believe deserves additional consideration. [...] [/QUOTE]--Brenna M. Henna, L. L. Cavalli-Sforzaa,1, and Marcus W. Feldmanb,2 Edited by C. Owen Lovejoy, Kent State University, Kent, OH, and approved September 25, 2012 (received for review July 19, 2012) http://www.pnas.org/content/109/44/17758.full [/QB][/QUOTE]
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