When Does Polyploidy Occur?

Polyploidy occurs when the zygote, or first cell, has more than two sets of haploid chromosomes. In insects, polyploidy is mainly restricted to parthenogenetic species and is largely limited to 3n and 4n.

What causes polyploidy?

Mechanisms of Polyploidy

Polyploids arise when a rare mitotic or meiotic catastrophe, such as nondisjunction, causes the formation of gametes that have a complete set of duplicate chromosomes. Diploid gametes are frequently formed in this way.

What is polyploidy and how does it occur?

Polyploidy, the condition in which a normally diploid cell or organism acquires one or more additional sets of chromosomes. ... Polyploidy arises as the result of total nondisjunction of chromosomes during mitosis or meiosis.