What do we mean when we talk about race? Genetics, culture or a combination? Is it possible to quantify the nature/nurture relevance ratio? How about a child born from a black and a Jew, raised in Asia by a foster family? Which "race" do they get stamped on their Interwebz passport?
Those are precisely the cases that would have to be studied rigorously. They'd give much needed insight on how much of a person's traits are genetic and how much is cultural. But unfortunately science is censored so hard that it's impossible to do any meaningful research, especially when it's the kind that doesn't promise near-immediate profits.