The middle piece of the chromosome falls out and rotates 180$^circ$ and then rejoins

GENE MUTATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

The middle piece of the chromosome falls out and rotates 180

A	inversion
B	gene mutation
C	insertion
D	missive substitution

Explanation:

Detailed explanation-1: -An inversion occurs when a chromosome breaks in two places and the region between the break rotates 180° before rejoining with the two end fragments.

Detailed explanation-2: -What is an inversion? An inversion in a chromosome occurs when a piece of chromosome breaks off, turns round 180 degrees and reinserts itself back into the same chromosome. Chromosomes have two arms, a short ‘p’ arm and a long ‘q’ arm, joined at a narrow point called a centromere.

Detailed explanation-3: -Pericentric inversions are structural chromosomal aberrations caused by 180° rotation of the chromatin segment between these breaks, which result from two breaks on both sides of the centromere [4].

Detailed explanation-4: -So, the correct answer is ‘Inversion’.

There is 1 question to complete.

AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

GENE MUTATION