isogamy
Very low / TechnicalScientific, technical, academic (biology, botany, mycology)
Definition
Meaning
A form of sexual reproduction in which the gametes (sex cells) are similar in size and morphology; they are not distinguished as male or female based on their physical appearance.
The condition or state in which the fusing gametes are identical in form and size, typical in many algae, fungi, and some protozoa. It can be contrasted with anisogamy (fusion of dissimilar gametes) and oogamy (fusion of a large, non-motile egg with a small, motile sperm).
Linguistics
Semantic Notes
The term is used almost exclusively in biological contexts. It refers to a specific reproductive mechanism, not a social or behavioral concept. It is the default or primitive state from which anisogamy is thought to have evolved.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is consistent.
Connotations
None beyond the scientific definition.
Frequency
Extremely rare in both varieties, confined to specialist biological literature.
Vocabulary
Collocations
Grammar
Valency Patterns
[Organism] exhibits/is characterized by isogamy.Isogamy is found in [organism/group].Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Used in biological sciences, particularly in papers on evolution, reproductive biology, and taxonomy of lower organisms.
Everyday
Virtually never used.
Technical
Core term in specific biological subfields; precise and necessary for accurate description.
Examples
By Part of Speech
adjective
British English
- The isogamous reproduction of the species was detailed in the monograph.
American English
- Researchers studied the isogamous green algae for clues about early evolution.
Examples
By CEFR Level
- Some simple organisms reproduce through isogamy, where the sex cells look the same.
- Isogamy is less common in complex plants and animals.
- The evolutionary transition from isogamy to anisogamy is a key topic in theoretical biology.
- In isogamous species, the gametes are morphologically indistinguishable, requiring other mechanisms for mating type recognition.
Learning
Memory Aids
Mnemonic
Think ISO (equal/same) + GAMY (marriage/union) = a union of equals (same-sized gametes).
Conceptual Metaphor
A democratic union (both partners are identical contributors) as opposed to a specialized partnership (anisogamy).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'изогамия' – it is a direct and correct cognate with the same meaning.
- Ensure the context is biological reproduction, not social equality.
Common Mistakes
- Mispronouncing as 'iso-GAY-me' (stress is on the second syllable).
- Using it to describe social relationships.
- Confusing it with 'isomorphism'.
Practice
Quiz
Isogamy is primarily contrasted with which of the following?
FAQ
Frequently Asked Questions
No. Isogamy is a form of sexual reproduction because it involves the fusion of two gametes. In asexual reproduction, there is no fusion of gametes.
No. Humans exhibit an extreme form of anisogamy called oogamy, with large, non-motile eggs and small, motile sperm.
Isogamy is common in many unicellular organisms, such as certain algae (e.g., Chlamydomonas), fungi, and protozoa.
In isogamous species, gametes are typically divided into different 'mating types' (like + and - strains). They are morphologically identical (isogamous) but physiologically/biochemically distinct, preventing self-fusion.