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GATE 2021 BT – Question 16

Genetics, Cellular and Molecular Biology · Genetics: Chromosomal variation, sex determination, genetic disorders, population genetics, epigenetics · 1 mark · Multiple choice

The original chromosome has gene order L M • N O P Q, where • is the centromere. Which rearrangement is a paracentric inversion?

source diagram and its labels are reproduced in the attached image.
  1. Option A in the figure
  2. Option B in the figure
  3. Option C in the figure
  4. Option D in the figure

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Show answer and explanation

Correct answer: (B) Option B in the figure

Explanation

Option B reverses the N–O–P segment within one arm, preserving the centromere outside the inversion. A includes the centromere and C,D change copy number.