Biology Inheritance / Variation & Genetics SZABMU 2024
PMDC Verified Question 7 of 94
Which type of antibodies are present in person with phenotype of blood group AB?
A
Anti-A Antibody
B
Anti-B Antibody
C
Anti-A and Anti-B antibodies
D
No antibodies present at all
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: No antibodies present at all
Concept:

An individual's immune system will not produce antibodies against antigens that naturally exist on their own cells, otherwise it would trigger an autoimmune attack.

Solution:

  • A person with Blood Group AB possesses both Antigen A and Antigen B on the surface of their red blood cells.
  • Because both antigens are recognized as "self," the immune system does not generate antibodies against either.
  • Therefore, there are no anti-A or anti-B antibodies present at all in their blood serum.
  • This lack of antibodies makes them the universal recipient for blood transfusions.


Why other options are incorrect:

  • Producing any of these antibodies would cause their own blood cells to agglutinate (clump) and be destroyed.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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