No. Strict political boundaries (ancient or current) do not set variance in human genetics. There has always been movement between geographic regions. These migrations cause gradients in the frequencies of each genetic marker.
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myOrigins says 35% of my ancestry comes from the Southern Europe region. What does that tell me in terms of my shorter term ancestry vs. longer term ancestry?
myOrigins says 35% of my ancestry comes from the Southern Europe region. What does that tell me in terms of my shorter term ancestry vs. longer term ancestry?