Nobody be knowing these ppl be mixed. Dude lying. According to Dr Francis Cress Welsing black genes being the dominant gene is the reason for white supremacy. And the reason why black men demonized and hated on so much. Because we can annihilate and erase the white race just by having babies with white women or any other race because the black gene will be the dominant gene. Even white men and black women the dominant gene will be the black gene.
Thats literal horseshyt. There's no one 'dominant' gene for a bunch of inherited traits. There's literally billions of traits which, due to human mass migration over the last 50,000 years have ended up more in some groups than others.
You can even prove this with your eyes on a micro level by looking at a mixed black and white person. Their skin color is usually right in the middle of the parents, hair midway between afro and straight, nose, mouth, other features etc are generally evened out.
The perception of this has more to do with white society (at least historically) not accepting black or mixed people, but mixed race people look mixed race, unless you're looking at them with biased (either black or white) eyes.