[jlogajan]

It is hard to say if these differences are the result of culture or race.

Culture and individual variation are the major determinants of behavior. Race is a strong self-association factor -- we grow up with our own race, we tend to hand around with our own race, hence cultural identity tends to break along racial groupings.

[lepton]

Race is a strong self-association factor -- we grow up with our own race, we tend to hand around with our own race, hence cultural identity tends to break along racial groupings.

Bingo...and the author washes right over "race as genetic" vs. "race as typical of culture", and blends them together then claims that they are claimed to be gene-based.