1. The human genome is 99.9% the same in all people.
2. If we look at the 0.1% that does vary, 85% of this variation exists only between individuals and not between populations.
Both truisms are at best superficially true. They donâ€™t mean what many seem to think they mean. Moreover, theyâ€™ve been known to be misleading for some time; in the case of truism #1, from the moment it was first presented.
So Mr. Smarty Pants, how much do genes really differ within our species? And how much of this difference clusters into recognizable populations?