complementary gene: meaning, definition, pronunciation and examples
Low (specialist/technical)Technical/Scientific
Quick answer
What does “complementary gene” mean?
A gene that interacts with another gene to produce a particular trait.
Audio
Pronunciation
Definition
Meaning and Definition
A gene that interacts with another gene to produce a particular trait; neither gene alone can produce the trait, but together they do.
In genetics, one of two or more genes that must both be present in the dominant form to produce a specific phenotype. The concept is foundational in understanding non-allelic gene interactions.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning. Usage is identical in UK and US scientific literature. Spelling follows regional conventions for 'complementary/complimentary' but the term itself is standardized.
Connotations
Purely technical and neutral. The 'complementary' aspect refers to a functional completion, not a praise ('complimentary').
Frequency
Equally low frequency in both dialects, confined to genetics textbooks and research papers.
Grammar
How to Use “complementary gene” in a Sentence
Gene A and Gene B are complementary.The trait requires complementary genes.A mutation in either complementary gene prevents expression.Vocabulary
Collocations
Usage
Meaning in Context
Business
Not used.
Academic
Core concept in undergraduate genetics courses, specifically in dihybrid cross analysis and epistasis.
Everyday
Virtually never used.
Technical
Used in research on gene pathways, epistatic interactions, and functional genomics to describe specific biochemical partnerships.
Vocabulary
Synonyms of “complementary gene”
Strong
Neutral
Weak
Vocabulary
Antonyms of “complementary gene”
Watch out
Common Mistakes When Using “complementary gene”
- Misspelling as 'complimentary gene' (which would imply a free or praising gene).
- Using it to describe any two genes that work together, rather than the specific genetic condition where the *dominant alleles of both* are required.
- Confusing with 'epistatic gene' (a broader category which includes complementary gene interactions).
FAQ
Frequently Asked Questions
Complementary genes are both *necessary* for a trait to appear (like two parts of a machine). Supplementary genes modify a trait produced by a main gene; the supplementary gene alone does not produce the trait, but it changes the expression of the trait from the main gene.
It is a fundamental, classic term used in teaching Mendelian genetics and epistasis. In contemporary research, the specific molecular identities of such genes are known, so the term is used less frequently than more precise descriptions of the pathway or complex involved.
Yes, they can be on the same chromosome or on different chromosomes. Their complementation is based on their functional interaction in a biochemical pathway, not their chromosomal location.
In sweet peas (*Lathyrus odoratus*), flower colour: Two white-flowered varieties, each homozygous recessive for a different gene, when crossed, produce purple-flowered offspring because each parent contributes the dominant allele for the gene the other lacks, complementing each other.
A gene that interacts with another gene to produce a particular trait.
Complementary gene is usually technical/scientific in register.
Complementary gene: in British English it is pronounced /ˌkɒm.plɪˈmen.tər.i dʒiːn/, and in American English it is pronounced /ˌkɑːm.pləˈmen.t̬ər.i dʒiːn/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “They work like complementary genes. (Metaphorical use implying absolute mutual dependence)”
Learning
Memory Aids
Mnemonic
Think of a plug and socket – both are 'complementary'; neither works alone. Two complementary genes are like that plug and socket for a trait.
Conceptual Metaphor
A LOCK AND KEY; two parts that only function when combined.
Practice
Quiz
What does the discovery of complementary genes explain?