10
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Question 10 • Quiz

A chromosome has an inversion. Which describes a pericentric inversion?

Answer
A
deletion of genes within the same chromosome arm
B
switching of genes within the same chromosome arm
C
switching of genes around the centromere
D
deletion of genes around the centromere

Explanation

An inversion occurs when a chromosome segment breaks off, reverses direction, and reattaches, changing the order of genes rather than deleting them. A pericentric inversion includes the centromere, so the switched segment spans both sides of it. Therefore, “switching of genes around the centromere” is correct; an inversion confined to one chromosome arm is paracentric.

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