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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?

These sites request you send them a swab of your DNA? How long for results? I can tell you for sure that not one of my family ever had a DNA test performed, most ancestors would be way too old, before DNA tests were done.

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