Inversions are said to 'suppress crossing over.' Is this terminology technically correct? If not, restate the description accurately.

Key Concepts

Chromosomal Inversions

Chromosomal inversions occur when a segment of a chromosome is reversed end to end. This structural alteration can affect gene expression and recombination during meiosis. Inversions can be classified as paracentric (not including the centromere) or pericentric (including the centromere), influencing how they interact with homologous chromosomes during crossing over.

Crossing Over

Crossing over is a genetic process that occurs during meiosis, where homologous chromosomes exchange segments of genetic material. This exchange increases genetic diversity in gametes. However, when inversions are present, the alignment of chromosomes can be disrupted, leading to reduced or suppressed crossing over in the inverted region, which can affect the inheritance of traits.

Suppression of Crossing Over

The term 'suppression of crossing over' refers to the reduced likelihood of recombination occurring in regions of chromosomes that contain inversions. While inversions do not completely prevent crossing over, they can create configurations that lead to fewer viable recombinant gametes. This phenomenon can result in a lower frequency of certain genetic combinations being passed to the next generation.