In medicine there is many examples where genetics and environment create a difference for people. A person can have a multiple higher risk of diabetes just beca

In medicine there is many examples where genetics and environment create a difference for people. A person can have a multiple higher risk of diabetes just because they were born by parents with thrifty metabolism, caused by them or their parents eating a non-western diet. This doesn't mean there are significant biologically different from any other human. As a species, we, humans, have a natural wide range of adeptness to the environment. Some of that can carry with people for centuries or even longer. If we compared to what is common for all humans those differences are tiny and rather insignificant. Compared to social economic status, race differences are much smaller and tiny. If a scientist did a study comparing medical outcomes of a drug, selecting top 1% wealthy whites and compare to bottom 1% poor black, the results would not say much about how effective that drugs is based on race.