Actually, it isn’t. See here: http://blogs.discovermagazine.com/gnxp/2013/11/white-supremacist-part-black/#.UoN9l-ISZmp . Closer to the truth to say that about 5% of white people have admixture and that it tends to be less than 5%. Of course, this is partly because of the way that 23andme created their statistical map. If there were some set of markers derived from African ancestry that had become widespread in the white population, let’s say as a result of black immigrants to Britain in the 18th century (they were eventually completely absorbed), then they wouldn’t end up being used for this percentage-of-ancestry test.
Personally I think it’s just as likely, or even more likely, that the talk show simply made up the results in order to have a more entertaining episode.
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