Biology Inheritance / Variation & Genetics NUMS 2024
PMDC Verified Question 8 of 94
Which of the following is not related to ABO blood group system?
A
It is an example of multiple alleles
B
\(I^A\) and \(I^B\) are co-dominant
C
It does not code for any antigen
D
It obeys Mendel's law of inheritance
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: It does not code for any antigen
Concept:

The ABO blood group system is defined entirely by the presence or absence of specific glycoproteins on the cell membrane.

Solution:

  • The statement "It does not code for any antigen" is factually incorrect and therefore the right answer.
  • The entire ABO system is based on the I gene coding for specific enzymes that attach oligosaccharide antigens (Antigen A and Antigen B) to the surface of red blood cells.
  • Note: While Multiple Alleles and Co-dominance are non-Mendelian extensions, the underlying segregation of alleles still roughly obeys Mendel's Law of Segregation, making C the most glaringly false statement.


Why other options are incorrect:

  • Options A, B, and D are all true related characteristics of the ABO system.

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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