Question

A normal chromosome and its homolog carrying an inversion are given. the dot (•) represents the centromere. normal: a b c • d e f g h i j inversion: a b c • d g f e h i j what type of inversion is present and what is the name of the structure that will form during synapsis?

Answer 1

The type of inversion is Paracentric inversion.

There are two types of inversion at the chromosome level, depending on the centromere:

Paracentric inversions:

the centromere is not included in the inversion.

Pericentric inversions:

The centromere is included in the inversion which can transform a metacentric chromosome into an acrocentric chromosome.

the structure that will form during synapsis is inversion loop.

These inversions are balanced rearrangements but at the moment of meiosis they cause difficulties in pairing. There is most often formation of a pairing loop. The occurrence of recombination in the inverted segment causes the formation of abnormal gametes by duplication / impairment.