Biology Inheritance / Variation & Genetics AJK 2019
PMDC Verified Question 78 of 94
Which situation can reduce the chances of variation and genetic recombination?
A
Random fusion of gametes
B
Crossing over
C
Gene linkage
D
Mutation
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Gene linkage
Concept:

Genetic variation depends on the shuffling of alleles during meiosis. Anything that locks alleles together decreases variation.

Solution:

  • Gene linkage minimizes the chances of genetic recombination.
  • Because linked genes sit close together on the same chromosome, they are strongly inclined to be inherited together as an intact unit.
  • This physical grouping restricts independent assortment and reduces the probability that crossing over will separate them, thereby limiting new genetic combinations.


Why other options are incorrect:

  • Random fusion, Crossing over, and Mutation: These are all primary biological mechanisms that actively increase genetic variation.

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