Question

On what basis does the blood group in human decided?

Answer 1

1. Persons with blood type A have antigen A on the surface of their RBCs and antibodies against antigen B in their plasma, whereas people with blood group B have the opposite situation.
2. People with blood type A B have antigens A and B on the surface of their RBCs but no antibodies to either antigen in their plasma. People with blood group O do not have any antigens, however, they do have antibodies to both antigens, A and B.

Blood Group	Antigen on RBC	Antibodies in plasma	Donor's group	Recipient
A	A	Anti-B	A, O	A, AB
B	B	Anti-A	B, O	B, AB
AB	A, B	Nil	AB, A, B, O	AB
O	Nil	Anti-A, B	O	A, B, AB, O