Geneticists have long established that race and ethnicity are sociocultural constructs and not good proxies to describe genetic differences in disease risks and traits among groups. Some geneticists have pushed to use ancestry—genetic differences resulting from the part of the world a person’s ancestors came from—to explain those differences. Still, researchers have not settled on the best categories to use in genetics studies—or even whether categories are needed at all—and how to best use self-reported race and ethnicity. https://www.science.org/content/article/race-ethnicity-don-t-match-genetic-ancestry-according-large-u-s-study