plz expain the following table:-

Blood Group Antigens on RBCs Antibodies in Plasma Donor's Group

A A anti-B A,O

B B anti-A B,O

AB A,B nil AB, A, B, O

O nil anti-A,B O

1)​Blood group A...antigen on RBC.. A.. Antibodies..B...Possible donor..A& 
as the blood group A has antigen A ,and O blood group contains no antigen, So donor for a blood group A can be A OR O. 

This table tells that for blood transfusion antigens, should be same otherwise antibodies in receivers blood will attack antigens of donors blood, rbc will clog and severe reaction will arise in receivers body.

Now this applies for all blood groups and same will apply for other entries also.
For help refer to this table:
 
Blood group Antigen Antibody
A A B
B B A
AB A & B None
O None A &B
 

 

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