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Genetic Closeness of the East/West African SNP population clusters (blog source)
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[QUOTE]Originally posted by Gor: [QB] There are virtually no genetic clusters. They most commonly appear by error if you polarize genetic data by excluding 'intermediate' populations (note the plot and tree diagrams above exclude many): "[T]he inclusion of such [intermediate] samples demonstrates geographic continuity in the distribution of genetic variation and thus undermines traditional concepts of race." - Bamshad, Michael J., Wooding, Stephen, Salisbury, Benjamin A., & Stephens, J. Claiborne. 2004. "Deconstructing the relationship between genetics and race". Nature Reviews Genetics, 5,. 598–609 "The suspicion that we will find continuity should be piqued by the observation, acknowledged even by died-in-the-wool populationists like Risch and Wade, that there are, at least, “intermediate groups” found at the geographic and genetic boundary between two races, such as Ethiopians and Somalis between those to their north and south or South Asians between East Asians and Europeans, where the lines between the populations are blurred. Suspicion is also warranted by the fact that as geographically intermediate regions are added to the data, the genetic markers used to identify continental clusters become less powerful." - Glasgow, Joshua. (2009). A Theory of Race. Routledge. p. 104 "[C]lines might seem to contrast with work that has described human genetic variation as ‘clustered’" and:">75% of the total variance of pairwise FST can be captured by geographic distance alone. Adding information on genetic clusters to this model captures only an extra 2% of the variance." - Handley, Lori J. Lawson, Manica, Andrea, Goudet, Jérôme, & Balloux, François. 2007. Going the distance: Human population genetics in a clinal world. Trends in Genetics, 23, 432–439 What population is 'genetically closer' is relative to who is being compared, but there are no population clusters. There are barely any discontinuities in the genetic continuum. The only possible exception is if you found a steeper slope in a clinal trait such as skin colour (e.g. Sahara desert). The "genetic cluster" stuff is the worst form of racial pseudo-science spouted across blogs and forums. Oddly most people criticize the old [i]ids[/i] and [i]oids[/i] via cranial measurements, but then embrace this genetic form of typology - which is exactly the same. [/QB][/QUOTE]
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