Personality Correlates of Human Blood Groups

A blood type is a description of an individual’s characteristics of red blood cells due to substances (carbohydrates and proteins) on the cell membrane. The two most important classifications to describe blood types in humans are ABO and the Rhesus factor (Rh factor). Individuals with type A blood have red blood cells with antigen A on their surface and produce antibodies against antigen B in their blood serum. Individuals with type B blood have the opposite arrangement, antigen B on their cells and produce antibodies against antigen A in their serum. Individuals with type AB blood have red blood cells with both antigens A and B and do not produce antibodies against either antigen in their serum. Individuals with type O blood have red blood cells with neither antigen but produce antibodies against both types of antigens. Overall, the O blood type is the most common blood type in the world, although in some areas, such as Sweden and Norway, the A group dominates. The A antigen is overall more common than the B antigen.