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| quote: | Originally posted by MrJiveBoJingles
And the old canard about "total percentage of shared genetic code" is not relevant. There is indeed more genetic variation within extended families ("races") than between them, but the concept of "race" is based on recently shared ancestry and clusters of certain genes that result from this ancestry, and is still meaningful. |
Well, just so you know, the people actually doing the research disagree. 
| quote: | | Our evidence for clustering should not be taken as evidence of our support of any particular concept of “biological race.” In general, representations of human genetic diversity are evaluated based on their ability to facilitate further research into such topics as human evolutionary history and the identification of medically important genotypes that vary in frequency across populations. Both clines and clusters are among the constructs that meet this standard of usefulness: for example, clines of allele frequency variation have proven important for inference about the genetic history of Europe, and clusters have been shown to be valuable for avoidance of the false positive associations that result from population structure in genetic association studies. |
Rosenberg, N. A., Mahajan, S., Ramachandran, S., Zhao, C., Pritchard, J. K., Feldman, M. W. (2005) Clines, Clusters, and the Effect of Study Design on the Inference of Human Population Structure. PLoS Genet 1(6): e70 (emphasis mine)
Although clines and clusters are certainly interesting genetic topics with significant implications in medicine and evolutionary biology, they don't lend themselves to use in any kind of taxonomic classification, in large part because there are simply too many of them, and probably many more that we have yet to discover. It would certainly be unscientific to define our taxonomy based upon those clines and clusters which happen to be relevant to a particular, seperate, field of inquiry, such as medicine, while ignoring all others. But any taxonomic classification of race based upon these genetic markers is going to be just as arbitrary - except perhaps splitting at all or none of these points. But neither of those methods will result in a meaningful taxonomy of human biological race: according to one, we are all the same race, and according to the other, the races multiply exponentially. And certainly, in none of these cases will our hypothetical taxonomy correlate strongly with any of the many different lay interpretations of race, or self-identification.
The utility of classifying people according to certain genotypes and phenotypes for specific purposes in medicine or other fields of inquiry is unquestionable. However, taking these classifications outside of the scope which they are expressly created for and attempting to use them as a definition for "race" lacks both utility and integrity.
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