Biology Inheritance / Variation & Genetics SZABMU 2024 Reconduct
PMDC Verified Question 20 of 94
Two allelic genes at same locus, when expressed fully in an individual, it is considered as:
A
Co-dominance
B
Complete dominance
C
Incomplete dominance
D
Epistasis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Co-dominance
Concept:

Alleles can interact in ways where neither acts recessively.

Solution:

  • When two different alleles are present at the same locus and both are expressed fully and distinctly in the phenotype, the relationship is termed co-dominance.
  • A classic example is the AB blood group, where both the \(I^A\) and \(I^B\) alleles are fully expressed to produce both A and B antigens on red blood cells without any blending.


Why other options are incorrect:

  • Incomplete dominance: Results in a blended, intermediate expression (e.g., Pink flowers), not full, distinct expression of both.
  • Complete dominance: Only one allele is expressed while the other is completely hidden.

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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