This reminds me of a book I read some years ago, The Journey of Man, in which the story about mans travel from Africa and to the rest of the world. 44 individuals from Africa are all that the rest of the world descends from ...
Find it on Amazon: http://www.amazon.com/Journey-Man-Genetic-Odyssey/dp/0812971469/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1218914241&sr=1-1
/Sik
Biologists have constructed a genetic map of Europe showing the degree of relatedness between its various populations.
All the populations are quite similar, but the differences are sufficient that it should be possible to devise a forensic test to tell which country in Europe an individual probably comes from, said Manfred Kayser, a geneticist at the Erasmus University Medical Center in the Netherlands.
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Read more: http://www.nytimes.com/2008/08/13/science/13visual.html?_r=2&oref=slogin&oref=slogin
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