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Yes, and because most of us trace our ancestry to Europe, the info you get with your DNA test shows how the gene pool has moved from Africa north to western Asia and then Europe. And where these gene pools are then concentrated.

But the tests risk some bias in that certain groups of people (ie upper middle class) are far more likely to get their DNA tested. So the databases are populated by their DNA. Is that representative of all people living there? Or just the upper middle class?

I'd say the science is primitive at best, but will probably be more useful when a million people have been tested.
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