Hi Birgit. I'm no expert but if your read the info available on the sites that offer testing, they tell you that they are following the male DNA. The part they monitor gets passed down from generation to generation. Therefore all your brothers and male cousins should have the same DNA.They then go the next step and try to characterize the DNA patterns geographically. And from that they tell you your ancestors trace to a certain place or area, usually in Europe or western Asia.At least that is the theory. But the question is does it work in practice. Not in my experience.
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