![]() Inherited characteristics, such as blood types, tend to run in ethnic groups. Due to this genetic factor, the American Red Cross suggest that when people need blood, especially those with rare blood types, the best matches tend to come from people of the same race or ethnic background. The genes that a person inherits from their parents determine the mix of antigens and proteins in their blood. If it is present, the blood group is Rh-positive, but if it is absent, the blood group is Rh-negative.Ĭombining these two characteristics yields the eight most common blood types. Red blood cells may have another antigen called the Rh antigen on their surface. Blood group AB has both A and B antigens.Blood group O has neither A nor B antigens.Blood group A has A antigens on the red blood cells.This system classifies blood types as follows: These define blood types according to which antigens are present on red blood cells. People can define blood types using the ABO and Rhesus (Rh) blood group systems. Share on Pinterest A person’s blood type may fall into any of the 36 human blood groups. ![]()
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