Blood type is determined by "the presence or absence ... There are eight common blood types: A positive, A negative, B positive, B negative, O positive, O negative, AB positive and AB negative.
For instance, in India, the most common blood type is B-positive, whereas in Denmark, it is A-positive. The variation could be seen in ethnic groups. As per the Red Cross, Asian Americans are much ...
Rh-null blood was discovered in 1960. It is a blood type that lacks Rh antigens, a protein that is usually found in blood. People with this rare blood type often suffer from anemia. The golden blood ...