Now this is faily old (Jan 2005) and may have been brought up at the time:

http://www.scienceagogo.com/news/20050020225317data_trunc_sys.shtml

I've posted elsewhere some diagrams of human genetic gradients in Europe (I forget where but I'll look for it). It's obvious there are genetic gradients in the human population today. I maintain that this has always been so, even in Homo erectus times. Regional continuity theory says evolution proceeds by gene flow. We have been one continually evolving species since Homo erectus times. Any disagreement?