Do genetics have to do with football talents.?

Do genetics have to do with football talents.?
I just asked the question about if white qb's are better than black qb's and got some pretty interesting anwers. I would say Donovan Mcnabb is a bad example of a good qb. The only one that comes to mind is Warren Moon. I think that white people tend to make better qb's. And I think that blacks pretty much dominate any other position, especially running back defensive line and defensive back.
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