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NEET2026BiologyChapterActual

A blood sample from a patient is analyzed and found to contain both anti-A and anti-B antibodies in the blood plasma. Which of the following correctly identifies the patient's blood group and the status of antigens on the surface of their red blood cells (RBCs)?

Options

  1. ABlood group AB; Both antigens A and B are present on RBCs
  2. BBlood group O; Both antigens A and B are absent on RBCs
  3. CBlood group O; Both antigens A and B are present on RBCs
  4. DBlood group AB; Both antigens A and B are absent on RBCs

Correct answer

B. Blood group O; Both antigens A and B are absent on RBCs

Step-by-step solution

The ABO blood grouping system is based on the presence or absence of two surface antigens, A and B, on the red blood cells (RBCs). The plasma of different individuals contains natural antibodies, anti-A and anti-B. Individuals with blood group O do not have any antigens (neither A nor B) on the surface of their RBCs. Because they lack these antigens, their immune system produces both anti-A and anti-B antibodies in the blood plasma. Therefore, a blood sample containing both anti-A and anti-B antibodies belongs to b

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