Are the Five Percenters the ones who believe white people were created in a lab? Oh goodness.
The Nation of Islam is the one that teaches that "whites" were the result of selective breeding -- carried out by the mad-scientist named Yakub -- of certain members of the original black race, over hundreds of years. Basically, Yakub only allowed the lighter-skinned blacks to interbreed, eventually producing the "white" race (and, along the way, also producing the brown, red, and yellow races). The Five Percenters might include some or many who also believe in that, but I'm not sure. The Five Percenters don't seem to emphasize it, if some do believe it.
But it's also good to understand that the Nation of Islam taught this idea, as a response to the American society of the 1920s and '30s, which often depicted Africans as sub-human. The Yakub story is a reaction to American racism, and it simply does to whites what many whites had done, and were doing, to blacks. I refer you to the racist interpretations (communicated especially by antebellum Southern Baptists) of the Noah/Canaan/Ham story, in which black inferiority is justified by claiming that blacks are descendants of a cursed Ham/Canaan. (A good book on this is Noah's Curse
.) And then you also have another basis of black inferiority coming out of the "mark of Cain" narrative in Genesis, a narrative that seems to have been utilized often in 19th- and early 20th-century Mormonism.