There is really no basis for any sort of theory that says underperformance of Black Americans is purely due to genetics.
Primarily because genetic diversity among Black people is too broad. In other words, if you randomly compare the genetics between two randomly selected Black people, the difference, on average, will be far greater than comparing any two randomly selected white people.
This is simply because all of humanity stems from Africa, so that is where the most diversity lies.
There are hundreds of genetic markers involved in something as comparatively simple as skin color. The genetic markers involved in something as complex as intelligence are likely orders of magnitude more complex.
You might be able to extrapolate something from certain sub-groups that branch from very narrow branches of the human diaspora, but you certainly could never, ever come up with something that made any sense to apply to the extremely broad strokes that we use to "group" people here in this melting pot we call the USA.
Primarily because genetic diversity among Black people is too broad. In other words, if you randomly compare the genetics between two randomly selected Black people, the difference, on average, will be far greater than comparing any two randomly selected white people.
This is simply because all of humanity stems from Africa, so that is where the most diversity lies.
There are hundreds of genetic markers involved in something as comparatively simple as skin color. The genetic markers involved in something as complex as intelligence are likely orders of magnitude more complex.
You might be able to extrapolate something from certain sub-groups that branch from very narrow branches of the human diaspora, but you certainly could never, ever come up with something that made any sense to apply to the extremely broad strokes that we use to "group" people here in this melting pot we call the USA.