Biology Inheritance / Variation & Genetics MDCAT 2019
PMDC Verified Question 77 of 94
In which situation, genes are not assorted independently during meiosis in a chromosome?
A
When genes are not linked and their loci are far apart
B
When there are too many genes on a chromosome
C
When some genes have mutated on the chromosome
D
When genes are linked and their loci are close to each other
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: When genes are linked and their loci are close to each other
Concept:

Independent assortment is hindered by the physical linkage of genes on a DNA molecule.

Solution:

  • Mendel's law of independent assortment assumes genes behave independently.
  • However, if genes reside on the same chromosome and their loci are physically close to each other, they are inherited as a single block.
  • Such linked genes do not obey the law of independent assortment and will stay together during meiosis, preventing independent segregation.


Why other options are incorrect:

  • Option A: Genes that are far apart on the same chromosome often undergo crossing over, allowing them to effectively assort independently.

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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