Any individual human has about 20,000 genes. About 75% of those are the same for everybody. The rest vary significantly from one person to the next, but they don’t line up with our ideas about racial groups.
Joseph Graves, Jr. is currently (2019) Professor of Nanoengineering at the Joint School of Nanoscience & Nanoengineering and author of The Emperor's New Clothes: Biological Theories of Race at the Millennium.
Richard Lewontin is currently (2019) Professor Emeritus of Biology and Alexander Agassiz Professor of Zoology in the Museum of Comparative Zoology, Emeritus at Harvard University. He has written many celebrated books on evolution and human variation books including The Triple Helix.
Jonathan Marks is currently (2019) Professor of Anthropology at the University of North Carolina at Charlotte. He is the author of Tales of the ex-Apes: How We Think About Human Evolution, and Human Biodiversity and What It Means to Be 98% Chimpanzee.