you cannot really kike it, since it works also with medical science.
Take for example some genetic disease in homogeneous people: the greeks have, for the 90% of people, an illness called 'thalassicemy', it is an illness proper ONLY to greeks and cypriots.
Italians have for a good 80%, the mutation of the gene of the homocistein that brings coronary problems.
Africans have a very rare form of anemy.
It is linked to the genetic of the ethnicity. So in this genetics cannot lie.