Biology Inheritance / Variation & Genetics PMC 2020
PMDC Verified Question 68 of 94
When both the alleles of a gene pair are same, the organism is said to be:
A
Heterozygous
B
Homozygous
C
Genotype
D
Phenotype
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Homozygous
Concept:

The allelic composition of an individual determines their genetic state for a particular trait.

Solution:

  • When both alleles of a gene pair are the same (e.g., AA or aa), the organism is structurally homozygous.
  • In contrast, having two different alleles (e.g., Aa) makes the organism heterozygous.


Why other options are incorrect:

  • Genotype: This is the overarching term for the genetic makeup of an organism, encompassing both homozygous and heterozygous states.
  • Phenotype: The observable physical expression of the trait, not the underlying allele pairing itself.

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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