How are human blood grouped based on surface antigens on RBCs?

How are human blood grouped based on surface antigens on RBCs?
  1. By the presence or absence of antigen A
  2. By the presence or absence of antigen B
  3. By the presence or absence of antigen A and B
  4. By the presence or absence of Rh factor

Solution

Human blood is grouped into A, B, AB and O systems based on the presence or absence of two surface antigens, A, B on the RBCs.

Asked in: NCERT

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