Biology Inheritance / Variation & Genetics BUMHS 2022
PMDC Verified Question 59 of 94
In which blood group both the antigens are present?
A
Blood group 'A'
B
Blood group 'B'
C
Blood group 'AB'
D
Blood group 'O'
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Blood group 'AB'
Concept:

Blood types are defined by the presence or absence of specific glycoproteins (antigens) on the surface of red blood cells.

Solution:

  • The \(I^A\) and \(I^B\) alleles show co-dominance.
  • In an individual with genotype \(I^A I^B\) (Blood group AB), both alleles are fully expressed.
  • Consequently, both Antigen A and Antigen B are present on the surface of their red blood cells.


Why other options are incorrect:

  • Group A: Only has Antigen A.
  • Group B: Only has Antigen B.
  • Group O: Lacks both Antigen A and Antigen B.

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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