[BluffTHIS!]

How ancient? We each have approximately 100K genes I believe, and after so many generations, like 100, you start dropping genes from some of your ancestors. Thus even if you could be certain you were descended from a particular person back that far, you might not actually possess any of his genes. So this factor would limit such a study to some small degree although of course all of your genes are inherited from even further back. Also from what I have read, there are limitations on determining the ethnicity of one's ancestors going back very far, and that would be key in determing travel patterns. Perhaps some poker playing geneticist will chime in here and elaborate.