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02/07/2008: "Culture = heritage = values = biology, new paper suggests"
Ethnic groups may differ both in culture and in genes, but these two dimensions of ethnicity are not independent. Differences in culture are barriers to gene flow; over time, such barriers differentiate gene pools. Conversely, genetic intermixture bring separate gene pools closer together, but also serves to homogenize cultures.
[ No surprises here. ]
http://genetics.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.pgen.0040004