Divergent histories of languages and genes
Charles Darwin saw the history of languages as a model for "descent with modification" in biological evolution; and researchers from Thomas Jefferson to Luigi Luca Cavalli-Sforza and beyond have been excited about the idea of combining linguistic, biological, and geographical evidence to shed light on the history of human populations.
Most recent linguists and anthropologists who are knowledgeable about such topics have been skeptical about how close we should expect linguistic and biological descent to be, in general. There are many ways, both wholesale and retail, for people to end up speaking a language different from the language of their ancestors, and similarly many ways for genes to flow from one speech community to another.
A recent contribution to the skeptical side of the discussion is Hafid Laayouni et al., "A genome-wide survey does not show the genetic distinctiveness of Basques", Human Genetics, published online 1/16/2010.
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