The function that describes how evolution distributes intelligence and its increase to individuals is a genetic algorithm of tournement brackets that is rewarded into the direction of more existence in the world.

A better question might be: "Does intelligence impart an added increase in survival to some races in some environments, wheras be less so rewarded into existence in other species in other environments" and might this "crabs in a bucket" vs "iron sharpens iron" duality also occur inside the same species?

https://www.youtube.com/watch?v=YMS70m-OzXo

One thing to buoy the spirit of the unter-menches is that there is room at the two-sigma tails for a black man to be higher functioning in every way than a median white man, you just have to work an twice as hard for it, just to stay in place.