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So it proved: a statistical model lumped participants into 17 groups based only on their DNA, and these groupings matched geography. People across central and southern England fell into the largest group, but many groupings were more isolated, such as the split between Devonians and Cornish in Britain’s southwest.
People who trace their ancestry to the Orkney Islands, off the northeast coast of Scotland, fell into three distinct categories. They are likely so differentiated because the islands made it hard for different populations to mingle.
originally posted by: DBCowboy