Here's a great related paper: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735096/?_escaped_fragment_=po=19.2308 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC27

Here's a great related paper: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735096/?_escaped_fragment_=po=19.2308 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2735096/?_escape... The authors took SNP data from 3,000 Europeans and overlay a PCA plot of it on a map of Europe. The result is that clusters in the PCA plot roughly align with national boundaries. They are also demonstrate that: > an individual’s DNA can be used to infer their geographic origin with surprising accuracy—often to within a few hundred kilometres.