On: The Racial Dot Map: One Dot Per Person for the Entire U.S.

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This is not accurate, to the best of my knowledge. I've consistently read roughly 20% European ancestry as the average for African-Americans. One source: http://blogs.discovermagazine.com/gnxp/2010/05/genetic-varia...

Of course, in general, legal racial categories may not map to anything genetic.