SecondCor521
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
I just watched this YouTube video, which is about a pair of identical twins doing those DNA ancestry test kits from five different companies and finding out whether their ancestry is from Sicily or Eastern Europe or whatever:
At about the 6:12 mark, they talk about how these things generally work:
My question is, let's say they compare my ancestry to their database and find out that my ancestry is Scottish. That's because my DNA variations match those of the Scottish people in their database.
It seems to me they have a recursive sort of problem.
How do they know that those Scottish people in their database are Scottish? Do they only take DNA samples from people in kilts playing bagpipes and with a rich brogue? What if those Scottish people that they tested were just one generation or two descended from a group of Russian Jews?
How about their Chinese samples? What if those people in Shanghai that they sampled were actually descended from people in Siberia or Nepal or Mongolia or Japan?
Maybe they take lots of samples from a geographically and historically "pure" place, but it seems to me that not many of those exist unless one is talking about an Amazonian tribe which has never had contact with outsiders. I mean, my family history involves migration throughout the United States and further back throughout England, Scotland, Germany, and France. In various world wars, I'm sure there were a lot of soldiers from many different countries who were fathering children far from home.
At about the 6:12 mark, they talk about how these things generally work:
My question is, let's say they compare my ancestry to their database and find out that my ancestry is Scottish. That's because my DNA variations match those of the Scottish people in their database.
It seems to me they have a recursive sort of problem.
How do they know that those Scottish people in their database are Scottish? Do they only take DNA samples from people in kilts playing bagpipes and with a rich brogue? What if those Scottish people that they tested were just one generation or two descended from a group of Russian Jews?
How about their Chinese samples? What if those people in Shanghai that they sampled were actually descended from people in Siberia or Nepal or Mongolia or Japan?
Maybe they take lots of samples from a geographically and historically "pure" place, but it seems to me that not many of those exist unless one is talking about an Amazonian tribe which has never had contact with outsiders. I mean, my family history involves migration throughout the United States and further back throughout England, Scotland, Germany, and France. In various world wars, I'm sure there were a lot of soldiers from many different countries who were fathering children far from home.