The finest scale genetic map of any country offers a detailed look at the history and ancestry of the people of the British Isles, Nature News reports. Scientists analyzed the DNA of thousands of living people in Britain for a study reported in this week's issue of Nature and found that many still live where their distant ancestors did, in regions defined by ancient tribal kingdoms. The study also found that today's Welsh have the most genes in common with the earliest inhabitants of the islands, who arrived about 10,000 years ago. Invaders such as the Vikings and the Romans left less of a genetic legacy than expected, although 25% of the genome of people in the far north Orkney Islands stems from the Vikings.
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