Mixed genes: Interactive world map of human genetic history reveals likely genetic impacts of historical events

When individuals from different groups interbreed, their offspring’s DNA becomes a mixture of the DNA from each admixing group. Pieces of this DNA are then passed along through subsequent generations, carrying on all the way to the present day. Researchers have now produced a global map detailing the genetic histories of 95 different populations across the world, spanning the last four millennia.
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Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/top_science/~3/5cj8Jrrz_6k/140213142305.htm