There are some genetic markers and traits that vary more between races than individuals, but overall genetic variation within a specific population is much greater than the variation between races.
But it doesn’t follow that race couldn’t possibly be a useful biological classification. Even if the distributions of two groups overlap strongly when any one trait or marker is considered, the groups might still be easily distinguished when you look at the whole configuration space—consider an illustrative diagram.
But it doesn’t follow that race couldn’t possibly be a useful biological classification. Even if the distributions of two groups overlap strongly when any one trait or marker is considered, the groups might still be easily distinguished when you look at the whole configuration space—consider an illustrative diagram.