"No, I know that there are no discernible racial characteristics."
Nonsense. Put 100 sub-Saharan Africans, 100 Han Chinese, and 100 Caucasians in a stadium, have them mill around together for a while and I will sort them back into their racial groups with 100% accuracy by using their easily discernible racial characteristics.
Physical characteristics are influenced by genes and environment and so are other characteristics, such as personality. South American Indians are much more stoic than are Italians. To what extent that is due to genes rather than culture remains to be seen, but genes are responsible to some extent.
Don't be a politically correct fool.