While looking for this info, I came across this awesome tidbit: James Watson, who claimed blacks are intellectually inferior to whites, is 1/6 black. Wonder how he felt on finding that out, especially since he's the guy who said, "I didn't win a Nobel prize. I won the [meaning most important ever] Nobel prize."

Probably not terribly affected, as he has plenty of information about his intelligence screening off (EDIT: as steven says, this is not the correct term) his ancestry, and he AFAIK never claimed black people to be 'inferior' in any sense other than lower average IQ.