Explanation:
Blood groups are designated on the basis of antigen present on the surface of their RBCs. e.g., Person with blood group A have antigen A on surface of their RBCs and antibody B in plasma. Incompatibility during blood transfusion leads to reaction between antigens on the cells and antibodies in plasma, which produces clots that clog Human ABO blood groups and their compatibility is shown as:
| Blood group | Geno type | Antigens in Red Blood Corpuscles | Antibodies in blood plama | Can give blood to | can get blood from |
| A | |A|A Or |A|O | A | b | A,AB | A,O |
| B | |B|B Or |B|O | B | a | B,AB | B,O |
| AB | |A|B | AB | None | AB | All |
| O | |O|O | None | a,b | All | O |
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