The Brasilian researcher is a member of the Human Genome Organization and has good credentials; not all of his work is accepted by all geneticists, and his percentages are based on a very small sample-- but that said, much of the reporting on his work is selective and mis-interpreted, completely mis-representing his research!
Read what he found- "white people have, on average, 33 percent of genes that were ...Amerindian...and 28 percent African. Now how could he say this if there were NO group differences? He went on to say that European men often fathered children with black and Indian women. From this he concluded "...our data indicate that, in Brazil as a whole, color is a weak predictor of African ancestry." (Boston Globe)
True in the States as well- remember the "passing for white" of the gone but not forgotton segregation days? And laws about miscegenation? Bob Jones University is a living fossil from that era.
Greg Stephens is correct in that the great majority of human genes are similar (in fact most, apparently are the same as those of rats and pigs, enabling gene splicing among different animals). The differences are in the miniscule number that do differ.
What is true is that NO differences in basic intelligence have been demonstrated. What is also true is that many of the differences we notice are rather new developments on the family tree, and as such are superficial. What the Frenchman said!