Question

how is the blood group of a person decided ? what makes the blood group positive or negative

Answer 1

The blood group of a person decided by two proteins called antigens and antibodies.

The blood with antigen A and antibody b is A
The blood with antigen B and antibody a is B
The blood with antigens A and B and no antibody is AB
The blood group with antibodies a and b and no antigens is called O


Now there is another antigen called Rh positive. This Antigen comes from the monkey Rhesus. If this antigen is in your blood, your blood group is positive, else negative.


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