What does isogamous mean?
Isogamous describes a form of sexual reproduction in which the reproductive cells, or gametes, are essentially identical in size and structure. Any two gametes can therefore unite without a specialized sperm-and-egg distinction. The term is used chiefly in biology when discussing algae, fungi, and some primitive animals, as well as the reproductive systems of microorganisms. It contrasts with anisogamy, in which the gametes differ noticeably, typically as a larger egg and a smaller, more mobile sperm. Isogamy is also associated with the broader biological concept of mating between equivalent individuals, although the word most directly emphasizes the similarity of the cells involved in fertilization. As a specialized term, isogamous is most useful in scientific and educational contexts rather than ordinary conversation. Its name reflects the underlying idea of equality: the gametes have the same basic form rather than being divided into contrasting reproductive types.
adjectiveDescribing reproduction in which the gametes are alike in size and structure, or an organism that produces such gametes. In contrast to anisogamy, isogamy does not involve distinguishable sperm and egg cells.
- Relating to or characterized by reproduction involving gametes that are morphologically indistinguishable.
- Relating to or describing organisms that reproduce through such gametes.
"The species exhibits isogamous reproduction, with each gamete fusing with an identical counterpart."
"The green alga is isogamous, producing motile cells of essentially the same size and shape."
"Isogamous mating systems occur in several primitive aquatic organisms."
Isogamy turns reproduction into a match between equivalent partners: there is no specialized sperm-and-egg distinction to bridge.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does isogamous come from?
Isogamous was formed from Greek iso-, meaning “equal,” and gamos, meaning “marriage” or union. The same roots produced isogamy, the noun for the process, and isogamete, a gamete equal in form to another. Related biological terms include anisogamous, in which the gametes are unequal, and heterogamous, in which they are structurally different.
Related word forms
How isogamous is actually used
This is chiefly a specialized biological term, especially used in botany, zoology, and microbiology. It is more precise than simply saying that male and female gametes are alike because it focuses on the absence of morphological differences between the gametes.
Easily confused with isogamous
Isogamous is the adjective describing the reproductive condition, whereas isogamy is the noun naming the process.
Isogamous specifically concerns the similarity of gametes, while homogamous more broadly describes sexual reproduction involving sex cells of the same general type.