A chromosome has an inversion which describes a paracentric inversion

Answer;

Switching of genes around the centromere.

Explanation; Inversion is a type of chromosome rearrangement in which chromosome segment is inverted end to end. There is no deletion or addition of segments, segments just change invert in the chromosome. An inversion occurs when a single chromosome undergoes breakage and rearrangement within itself. There are two types of inversions - paracentric and pericentric. Paracentric inversion does not include centromere. Genes are switched within one of the arms of the chromosome, while a pericentric inversion includes centromere, so genes are switched around it.