Biology Inheritance / Variation & Genetics DUHS 2022
PMDC Verified Question 64 of 94
White eyed trait in Drosophila is due to:
A
Linkage
B
Mutation
C
Crossing over
D
Genome
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Mutation
Concept:

New phenotypic traits in a population originally arise from alterations in the DNA sequence.

Solution:

  • The wild-type eye color in Drosophila melanogaster is naturally red.
  • The white-eyed trait is an X-linked recessive characteristic that arose specifically due to a genetic mutation in the eye color gene.
  • Thomas Hunt Morgan discovered this white-eyed male mutant, providing the first solid evidence that specific genes reside on specific chromosomes.


Why other options are incorrect:

  • Linkage and crossing over are processes related to the inheritance and shuffling of existing alleles, not the origination of a fundamentally new mutant allele like the white eye.

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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