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<p>It’s already been demonstrated in population samples from (and within) the USA, Europe, East Asia, and Africa. There is a natural clustering of individuals’ genetic profiles derived without any knowledge of social race/ethnic labels, by running standard statistical algorithms on the gene measurements. The output of these algorithms are nothing but “scientific criteria for race or ethnicity”, and the races and ethnic groups they isolate match the pre-existing social constructs in all cases considered so far. </p>
<p>For instance, sorting individuals by their position on the principal axis of genetic variation, gave 100 percent accurate separation of Jews from non-Jews in a mostly American sample of several hundred people; all self-reported Jews were on one side of the scale and the non-Jews on the other side. Two principal components separated Finns and Swedes at 90 percent accuracy (and using more components would of course improve the power of a test to distinguish those groups). Similar separations are observed within East Asian and African populations, where socially-defined “race” or “ethnic group” labels closely match the genetically discovered clusters of gene profiles. Pictures of the samples show a very clear clustering in 2 dimensions, and approximately replicate a geographic map (again, without any geographic input, but purely from the genetics). </p>
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<p>That’s a straw-man, of course; the content-free terms “separate” and “subspecies” are there for demagogic effect. </p>
<p>DNA studies do indicate that statistically separable groups exist, can be classified, and line up with the socially constructed notions of race and ethnicity. Whether to go so far as to call those groups “subspecies” is a linguistic and political question, not a biological one. The biological fact is that the groupings exist and generally confirm the pre-genetic classifications, in the same way that DNA has solidified the qualitative taxonomy of Linnaeus.</p>
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<p>Nobody who has read the current literature could claim this. 100 percent and 90 percent accurate separation using one or two principal components is a very strong result; it means that separation of groups by genetics is rather easy. Far easier than anyone expected before seeing the data. </p>
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<p>That has nothing to do with the ability to objectively cluster individuals’ genomes into racial groups, and suggests a misleading mental picture of “big blobs that mostly overlap” when the published clustering diagrams are of blobs that are far apart or barely touch each other near the edges.</p>
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<p>The emergence of identifiable groups with visible differences in the last 20000 years or less indicates that human evolutionary divergence is extremely rapid. This supports the notion of racial and ethnic distinctions having a genetic basis beyond the simple visible characteristics. </p>
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<p>That’s a nice theory, but it’s a load of nonsense. The comparison of “within group” and “between group” variation says nothing about the ability to reliably discriminate, say, Jews from non-Jewish Europeans, Finns from Swedes, and other groups in geographic proximity.</p>