What does zygosity mean?
Zygosity is the state or condition of being a zygote: a cell produced when two reproductive cells, or gametes, fuse during fertilization. The process typically restores a diploid chromosome complement, although the exact genetic outcome can vary among organisms. The word belongs chiefly to specialized biological and genetic writing and is much less common than zygote, which names the resulting cell or organism directly. It may be useful when a discussion focuses on a stage, condition, or transition rather than on the structure itself. For example, describing the establishment of zygosity emphasizes what has happened to the developing cell, while mentioning a zygote identifies what the cell is. Because its usage is limited and sometimes perceived as unnecessarily elaborate outside specialist contexts, zygosity is best used in technical, academic, or explanatory passages where the distinction between the entity and its condition is meaningful.
nounThe state or condition of being a zygote, especially a cell formed through the fusion of two gametes.
- The state or condition of being a zygote, especially a cell formed through the fusion of two gametes.
"The process restores the diploid chromosome complement and establishes zygosity in the new cell."
"The zygosity of the developing cell is evident in its restored diploid chromosome complement."
"Under favorable conditions, the organism can persist briefly in a zygote-like state before developing further."
The plural is grammatically regular but rare in use.
"The study compares different zygosities observed during early development."
Fertilization is the event; zygosity is the condition that follows.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does zygosity come from?
Zygosity was formed in English by adding the noun-forming suffix -ity to zygote. Zygote comes through New Latin from Greek zygōtos, meaning “yoked,” ultimately related to zygon, “yoke” or “yoking.” The shared zygo- element also appears in words such as zygotic, zygogenesis, and zygospore.
Related word forms
How zygosity is actually used
This is a formal and comparatively uncommon biological term. In general writing, zygote is normally preferred when referring to the resulting cell or organism itself.
Easily confused with zygosity
A zygote is the cell or organism formed by the fusion of gametes, whereas zygosity is the state or condition of being that zygote.