What does heterogamete mean?
A heterogamete is a reproductive cell that differs in size or form from the other kind of gamete produced by the same species. This is the defining feature of anisogamy, a reproductive system in which sperm are typically small and motile while eggs are larger and contain more cytoplasm. The term therefore links a gamete’s physical identity to the sex-specific reproductive roles it plays. It should not be confused with heterogamy, the process or condition involving fusion of unlike gametes, nor with isogamete, a gamete that is essentially indistinguishable from the partner gamete. “Heterogamete” is mostly encountered in technical biology, including botany, zoology, and genetics, and is especially useful when discussing gamete size, form, or development rather than the behavior of whole organisms. For most readers, the concept is most familiar from human reproduction, where the sperm and egg are heterogametes. Outside specialist contexts, the simpler terms egg and sperm are usually more natural.
nounA gamete that differs in size, form, or structure from the other gamete involved in reproduction, especially the smaller sperm or larger egg characteristic of anisogamy.
- A reproductive cell that differs in size, form, or structure from the other kind of gamete, as the sperm and egg of anisogamous organisms do.
"In anisogamous species, the egg is a large heterogamete, whereas the sperm is a small, motile heterogamete."
"In anisogamous species, the egg is a large heterogamete, whereas the sperm is a small, motile heterogamete."
"Researchers measured the heterogamete to determine whether it differed in size and morphology from the other reproductive cell."
The plural is regular and is used when referring to the two differently sized or differently formed reproductive cells of a species or to multiple such gametes generally.
"The eggs and sperm are heterogametes that differ markedly in size."
A sperm and an egg are heterogametes because they are gametes of very different sizes—a simple contrast that underpins much of sexual reproduction.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does heterogamete come from?
The term emerged in English during the nineteenth century from Greek heteros, meaning “different,” combined with gamete. The word gamete comes through French from Greek gamētēs, meaning “husband,” ultimately derived from gamos, meaning “marriage.” The prefix hetero- therefore emphasizes the unequal size or form that distinguishes one gamete from its counterpart.
Related word forms
How heterogamete is actually used
A specialized biological term, used chiefly in genetics, botany, zoology, and reproductive biology. It is relatively uncommon outside scientific contexts.
Easily confused with heterogamete
A heterogamete is an individual reproductive cell, whereas heterogamy is the condition or process in which unlike gametes fuse.