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:/

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-variation-among-african-americans/#.VBHQtvldUmg http://blogs.discovermagazine.com/gnxp/2010/05/genetic-varia... Of course, in general, legal racial categories may not map to anything genetic.