some South Indians, all of whom are caucasians are dark in skin tones and may be darker than some negroids.
In other words, we have other ways of identifying races than skin color. Facial characteristics are just as distinguishing. Michael Jackson knows that.
And that's the point. Like the other guy said, there is a "constellation of features" that identify race even if no single gene or identifier. Even though I may have 99% of my genes in common with an Asian man, the small handful of genes that make up identifiable characteristics are what we perceive as race.