I'm sorry, but that sort of thinking just doesn't pass the smell test.

We can easily identify the geographic locations of people's ancestors by looking at them. That means that we evolved quite a few exterior physical traits that are easily grouped and identifiable. Do you really think our brain, which is our most important survival trait, was immune to evolution? That people that moved to specific regions didn't have had selective pressures of some kind on the way we think?

Where this can go awry are the people that learn about this and then think that it's reason to discriminate against individuals or groups - of course it isn't. As you said, genetic diversity within groups is large. And even something like IQ certainly doesn't sum up the worth of someone, or even their brain.

The whole point of what I posted though was just to point out the fact that Wikipedia is, in fact, biased in what's put on there. It wasn't that long ago that it was perfectly OK as an academic to study the racial differences in IQ. Now? Good luck. Wikipedia reflects that.