Who said IQ was a true measure of intelligence anyway? It only measures a certain kind of mental ability. There is growing evidence that diet and environment can play a huge role in brain development. Also, differences in lifestyle can cause certain genetic traits to be expressed. Someone with poor nutrition, neglected and abused by parents, poor education and growing up in rough neighborhood just isn't likely to score high on most intelligence tests anyway.

Race itself is a vague generalization based more on cultural conditioning than on sound science.

How many races there are often depends of what country you’re in. In The US, we assume three races. In Brazil, it’s more than fifty. There also tends to be tremendous genetic variation within the "races".

White people have different eye colors, hair colors and body types. Some black people are light skinned or dark skinned. Asians from Japan look very different than Asians from Bali. Might they be defined as two different "races"? And who decides what constitutes a "race" anyway? And by what criteria?