Do blood groups vary according to race?

Experts studying different human populations are very interested in the distribution of blood groups. For example, it has been noted that Amerindians (American Indians) are practically always blood group O. There are very few pure Amerindians with blood group A, and group B is conspicuous by its absence. Asiatics have far more member of group B than Europeans Among Europeans, blood A dominates.

As for other blood grouping systems, they also show differences. When they are studied, they enable us to reconstruct or confirm the history and comings and goings of a population to or from a particular region, or country.