"Separation of the races is coded into our genes" What? How so? "Physical attributes influence us as well" But which physical attributes matter and which don't

"Separation of the races is coded into our genes" What? How so? "Physical attributes influence us as well" But which physical attributes matter and which don't is cultural. I'm tall. I don't only or even mostly hang around other tall people. I'm left handed. I don't hang out with left handed people. "but has also extremely skewed gender distributions in professions such as engineering and nursing; with almost only men in engineering, and women in nursing, despite massive attempts to balance the situation. This could be easily misinterpreted and claimed as evidence that Norway does not respect gender equality, but in fact it's more likely evidence of the opposite! People in Norway are more free to pursue what makes them happy." Or gender stereotypes which predated attempts at gender equality still persist and encourage people to think that certain jobs will make them happier than others even though this may not be true.