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Describe blood group.
A blood group is a classification of blood based on the presence of antigens on the surfaces of red blood cells (erythrocytes).
The human ABO blood group system is discovered by Karl Landsteiner in 1901. The four blood groups present are A, B, AB and O.
Human having blood group A possess two possibilities of antigen present in the blood: IAIA or IAIO
Human having blood group B possess two possibilities of antigen present in the blood: IBIB or IBIO
Human with blood group O has no antigen present in the blood: IOIO
Depending upon the antigen present in the particular blood group, AB blood group is known as the universal recipient while the O blood group is known as a universal donor.
AB Blood group is known as the "universal recipient" because AB blood has both A and B antigen and no antibodies to A, B in their blood. They can receive red blood cells from the donor of all blood types.