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What is Wrong With BLACK PEOPLE ???
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[QUOTE]Originally posted by Dead: [QB] [QUOTE]With k=6 Rosenberg et al. [49] found genetic clusters corresponding to (1) Africa, (2) Europe, Western Asia and part of Central Asia; (3) the Kalash of Pakistan; (4) East Asia and part of Central Asia; (5) Oceania; and (6) South America. Bamshad et al. [68] observed a separation between Africa and Eurasia with k=2, a split between Asia and Europe with k=3, and two African clusters with k=4, confirming that variation within Africa exceeds that among other continents [57, 69, 70]. EXCERPT FROM: Human Races: Classifying People vs Understanding Diversity. Current Genomics, 2005, 6, 000-000 Guido Barbujani* Barbjuani noted results can be mixed based on sampling, beginning assumptions, etc but once again, [b]someone you used as a "supporting" reference, debunks your claim that there is no support for such clusters. Your own guy which you referenced says there is.[/b] [/QUOTE]Barbujani does quote Rosenberg, but he/she debunks his continental clusters. See also Serre and Pääbo (2004). Serre and Pääbo (2004) argued that sampling often concentrates on “the extremes of continental land masses” (p. 1680), maximizing the geographic and therefore genetic distance between individuals presumed to belong to distinct continental clusters. Without “a sampling strategy that maximizes the geographic distribution of samples and keeps similar sample size for each geographical area,” they warned, researchers risked falsely creating “apparent substructures” (Serre and Pääbo 2004:1681). In contrast, when these researchers designed a study that sampled individuals “such that their geographic distribution around the world approximates the distribution of the human population as a whole and includes areas where Africa, Asia, and Europe meet,” the pattern of genetic variation they found was “one of gradients of allele frequencies that extend over the entire world, rather than discrete clusters” (Serre and Pääbo 2004:1679-1680) Rosenberg just took samples from distant locations (with few or no samples between those extremes). Its no wonder he produces clusters, since he polarized the data by missing lots of populations.Barbujani warns against this. So my "supporting reference" does not go against what I posted. [/QB][/QUOTE]
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