Ques. 1AIPMT 2001
What is correct for blood group O?
- No antigens but both a and b antibodies are present
- A antigen and b antibody present
- Antigen and antibody both absent
- A and B antigens and a, b antibodies present
Answer
(1) No antigens but both a and b antibodies are present
Solution
As per NCERT, blood group O has neither antigen A nor antigen B on the surface of RBCs.
⇒ Its plasma contains both antibodies, anti-A (a) and anti-B (b).
∴ Group O: no antigens, but both a and b antibodies are present.
Answer: (1)