Race Science for Non-Racists

There may not be enough samples for finer detail. People have tried to use 23andMe data to decide who gets tribal membership benefits. But the company says there's not enough genetic difference for that.

There's a lot of noise in genetic data. Each person's DNA is about half from each parent, but which parts are copied is somewhat random. Unless some population comes from a very narrow base, such as Thoroughbred horses (three founding sires, although many mares) or cheetahs (almost extinct at some point and have only a few common ancestors), strong genetic uniformity is rare. Some isolated human populations show it, but those are inherently ones that don't get around much.