[blam]

"Earlier, cruder studies, done before direct genetic testing was feasible, suggested that African-Americans were 25 or even 30 percent white. Shriver's project is not complete, but with data from 25 sites already in, he is coming up with 17-18 percent white ancestry among African-Americans. That's the equivalent of 106 of those 128 of your ancestors from seven generations ago having been Africans and 22 Europeans. "

I've always read that Blacks living in the USA are ~ 25% European.

[allmendream]

Well around 17-18% and around 25% are both reasonable estimates.

One sixth= 17%

rather than one fourth= 25%

would seem to be the updated figure based upon these results.