Blood group classification There are totally 8 blood groups in this world. They are:-
A+
A-
B+
B-
O+
O-
AB+
AB-
The universal blood group is O-. It can be transferred into any body.
A antigen + B antigen =>AB-
Sometimes A=I^0
A antigen ,A antigen => A or O(50-50%)
A(father)+B(mother)=> A
A,B Rn (antigen)=> AB+
