Dr Neil Risch, of Stanford, has shown that by analyzing DNA, can correctly match an individual's self-described race in 99.9 per cent of cases. There was a greater chance, he said, that researchers would incorrectly guess an individual's self-described gender.



There are readily identifiable clusters of points, corresponding to traditional continental ethnic groups: Europeans, Africans, Asians, Native Americans, etc. (See, for example, Risch et al., Am. J. Hum. Genet. 76:268-275, 2005.)



This clustering is a natural consequence of geographical isolation, inheritance and natural selection operating over the last 50k years since humans left Africa.



Two groups that form distinct clusters are likely to exhibit different frequency distributions over various genes, leading to group differences.



This leads us to two very distinct possibilities in human genetic variation:



Hypothesis 1: (the PC mantra) The only group differences that exist between the clusters (races) are innocuous and superficial, for example related to skin color, hair color, body type, etc.



Hypothesis 2: (the dangerous one) Group differences exist which might affect important (let us say, deep rather than superficial) and measurable characteristics, such as cognitive abilities, personality, athletic prowess, etc.

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