As to the OP, if Dr Watson did indeed, manage to study DNA and find Evidence that he believed suggests that african genes show less intelligence, this does not mean he is racist.

Albeit the comment sounds poitically incorrect and racist, if he were to subjectively view evidence of such, it would be statement of fact.


However, I personally find this to be a unscientific. In order to gather good hard evidence of such a claim I think we would need to gather an overwhelmingly large amount of data on a large part of populations, as well as on DNA (which is a lot of data in itself!).
I doubt we even have the technology today to isolate the "intelligence gene" in massive numbers of the population to study such.
I find it highly unlikely that race carries any weight on intelligence.
I cannot say at this time that it carries none.

But subjective, personal and observational evidence through-out my life shows no idication whatsoever that it does.

Native Americans might be assumed to carry less intelligence than Europeans simply because they lived a tribal, not technological lifestyle.
Yet many of the smartest people I ever knew were of native american descent and I often listen to native american music and read teachings of wisdom to calm my mind and gain insight on difficult issues.

I think Dr Watson made assumptions and was possibly swayed by petty urban beliefs- I cannot say that for certain.