Polyploidy

Part of speech: noun

Pronunciation: /ˈpɒlɪplɔɪdi/

Definitions

1. The condition of having more than two complete sets of chromosomes is referred to as the occurrence in cells, particularly impacting the genetics of species in plants and some animals
2. This phenomenon involves the presence of extra chromosome sets in an organism's cells, which can influence evolution and hybridization in various life forms
3. It describes a genetic situation where an organism possesses multiple sets of chromosomes, often resulting in significant variations in traits and species diversity

Etymology: Polyploidy describes a cell or organism carrying more than two complete sets of chromosomes, where most animals and many plants carry two. The word is built from "polyploid," itself made from the Greek "polys" (many) and "-ploos" (-fold), with the English suffix "-y" added to turn the adjective into a noun for the condition. The English form follows the German "Polyploidie," so the word was shaped in scientific German before it took hold in English. The "-ploid" element is the key to the whole family of terms. Its partner "haploid" means a single set of chromosomes, and the two words together describe a count of genetic sets rather than of individual chromosomes. A "diploid" organism has two sets, one from each parent, which is why the number of sets, not the number of chromosomes, drives the naming.