alt Hacker NewsAre they consistent across time and cultures? Are they corrected for differences in health, education, culture, wealth, etc? How big are racial differences compared to differences between people from different social classes?
How do you define racial groups? its something that constantly shifts. I have an encyclopedia for the 1950s that defines South Asians as "Caucasoid" which is not how most people now think.
You can do a dimensionality reduction on genetic variants and certain recognisable groups fall pretty clearly out of the data.