I dont think it has much to do with black genetics being more "athletic". I think they are generally taller than white folk, they also have a drive to make it. I remember when I played baseball in high school there was this black kid that the coach was trying to mold into the next Griffey, or whatever because he was speedy in the outfield. Forget the fact that he was garbage, he was black, had speed and looked like a baseball player.
Every 6' white kid playing ball in the suburbs should be told early to stick to a sport that they could succeed at. Basketball isnt that sport.