lethal gene: meaning, definition, pronunciation and examples
C1technical / formal
Quick answer
What does “lethal gene” mean?
A gene that, when inherited in a particular genetic combination (often homozygous), causes the death of the organism carrying it, typically before or shortly after birth.
Audio
Pronunciation
Definition
Meaning and Definition
A gene that, when inherited in a particular genetic combination (often homozygous), causes the death of the organism carrying it, typically before or shortly after birth.
A broader term for any genetic mutation that drastically reduces viability, sometimes used metaphorically to describe a fatal flaw or inherent destructive element within a system or plan.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling follows regional conventions (e.g., 'lethal' vs. 'lethal').
Connotations
Identical technical connotations. Potential metaphorical use is equally understood.
Frequency
Equally common in academic and scientific contexts in both regions. Rare in everyday conversation.
Grammar
How to Use “lethal gene” in a Sentence
The [organism] carries a lethal gene.A lethal gene was identified in the [population].[Gene name] is a lethal gene when homozygous.Vocabulary
Collocations
Examples
Examples of “lethal gene” in a Sentence
verb
British English
- The mutation can lethally affect development.
- The allele lethally homozygous condition was confirmed.
American English
- The mutation lethally impacts the embryo.
- Researchers determined the combo lethally disrupts cell function.
adverb
British English
- The gene combination acted lethally during the larval stage.
- The mutation is almost lethally effective.
American English
- The genetic defect is lethally potent in its homozygous form.
- The trait acted lethally in utero.
adjective
British English
- It had a lethal genetic condition.
- The study focused on lethal alleles in fruit flies.
American English
- They identified a lethal genetic mutation.
- The mouse model exhibits a lethal phenotype.
Usage
Meaning in Context
Business
Rare. Metaphorical: 'That acquisition strategy contained a lethal gene of unsustainable debt.'
Academic
Primary usage. Common in genetics, biology, and evolutionary studies papers.
Everyday
Very rare. May appear in popular science articles about health or inheritance.
Technical
Standard, precise term in genetics and molecular biology.
Vocabulary
Synonyms of “lethal gene”
Strong
Neutral
Weak
Vocabulary
Antonyms of “lethal gene”
Watch out
Common Mistakes When Using “lethal gene”
- Using 'lethal gene' to mean a gene that simply causes disease (non-lethal).
- Thinking the gene product is directly toxic like a poison.
- Confusing 'lethal' with 'infectious' or 'contagious'.
FAQ
Frequently Asked Questions
Yes, indirectly. In the heterozygous state (carrying one copy), some lethal genes can provide a benefit (like disease resistance), which explains why they persist in a population despite being fatal when homozygous.
Not exactly. A lethal gene specifically causes the death of the organism, often prenatally or very early in life. Many genetic diseases (e.g., cystic fibrosis) are serious but not immediately lethal and allow survival into adulthood.
Yes. Several genetic conditions in humans are considered lethal, often resulting in miscarriage, stillbirth, or death in infancy, such as some forms of Tay-Sachs disease or anencephaly.
They can persist if the heterozygous carriers have a survival or reproductive advantage (balancing selection), or if new mutations constantly introduce them. They can also be maintained in large populations where mating is random.
A gene that, when inherited in a particular genetic combination (often homozygous), causes the death of the organism carrying it, typically before or shortly after birth.
Lethal gene is usually technical / formal in register.
Lethal gene: in British English it is pronounced /ˌliː.θəl ˈdʒiːn/, and in American English it is pronounced /ˌliː.θəl ˈdʒiːn/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[Metaphorical] The corruption was the lethal gene in the company's DNA.”
Learning
Memory Aids
Mnemonic
Think of a lethal injection – it causes death. A 'lethal gene', in the right genetic combination, acts like an internal instruction for the organism to die.
Conceptual Metaphor
GENES ARE INSTRUCTIONS / BLUEPRINTS. A LETHAL GENE IS A FATAL FLAW IN THE BLUEPRINT.
Practice
Quiz
What is a primary characteristic of a recessive lethal gene?