Could it not also/instead be a social upbringing thing instead?
If the media I see regarding African Americans is indicative to their culture, we have no further to look than BET and the cornucopia of movies like "Hot Tub Time Machine", "Black Coffee", and "Dear White People".
The current african american culture appears broken. Single parent households are everywhere, anti-intellectualism is paramount... Book learning is "white people stuff".
It's always a pleasant shock to meet those from the African nations over here. They're kind, intelligent, and well spoken. It's especially funny/sad when american blacks try to communicate with them, and get distant and nasty when they realize they are from Africa.
Women, on the other hand, are trained from elementary school that they are good at "english, social studies, and soft sciences". Boys do the hard stuff. That is little to do with capability, but bad training from a scholastic age.