genetic drift: meaning, definition, pronunciation and examples
C2Technical, Academic
Quick answer
What does “genetic drift” mean?
A mechanism of evolution where allele frequencies in a population change over generations due to random sampling.
Audio
Pronunciation
Definition
Meaning and Definition
A mechanism of evolution where allele frequencies in a population change over generations due to random sampling.
The process by which gene variants (alleles) become more or less common in a population purely by chance, rather than due to natural selection, leading to changes in traits over time. This effect is more pronounced in small populations.
Dialectal Variation
British vs American Usage
Differences
No lexical or spelling differences. The term is standard in international scientific English.
Connotations
Identical technical, neutral connotations.
Frequency
Usage frequency is identical and confined to scientific discourse in both varieties.
Grammar
How to Use “genetic drift” in a Sentence
Genetic drift [VERB: occurs, happens, operates] in small populations.[NOUN: Population size] influences the strength of genetic drift.The [NOUN: change] was due to genetic drift.Vocabulary
Collocations
Examples
Examples of “genetic drift” in a Sentence
verb
British English
- The rare allele drifted to fixation over several centuries.
- Genetic variation can drift considerably in isolated communities.
American English
- The allele drifted out of the population entirely.
- Researchers modeled how traits would drift under different conditions.
adverb
British English
- The population changed driftily, not adaptively. (Rare, non-standard)
- N/A
American English
- N/A
- N/A
adjective
British English
- The drift process is neutral with respect to fitness.
- They studied the drift dynamics in a simulated population.
American English
- Genetic drift effects are strongest right after a bottleneck.
- The drift component of evolutionary change was significant.
Usage
Meaning in Context
Business
Not used.
Academic
Primary context. Used in biology, genetics, and anthropology lectures, papers, and textbooks.
Everyday
Virtually never used in everyday conversation.
Technical
The exclusive domain of use. Precise meaning in evolutionary biology and population genetics.
Vocabulary
Synonyms of “genetic drift”
Strong
Neutral
Weak
Vocabulary
Antonyms of “genetic drift”
Watch out
Common Mistakes When Using “genetic drift”
- Using 'genetic drift' to describe changes caused by natural selection.
- Confusing it with 'gene flow' (migration of alleles).
- Misspelling as 'genetic shift'.
- Assuming it only reduces diversity (it can also increase it locally).
FAQ
Frequently Asked Questions
Genetic drift is one mechanism that can cause evolution (change in allele frequencies). Evolution can also be caused by natural selection, gene flow, and mutation.
It tends to reduce variation within a single population over the long term, but it can increase differences between separate populations (divergence).
Genetic drift is a random, non-adaptive process. Natural selection is a non-random process where traits that improve survival and reproduction become more common.
The effect of random sampling error is stronger in smaller populations. In large populations, random fluctuations in allele frequencies tend to average out.
A mechanism of evolution where allele frequencies in a population change over generations due to random sampling.
Genetic drift is usually technical, academic in register.
Genetic drift: in British English it is pronounced /dʒɪˌnetɪk ˈdrɪft/, and in American English it is pronounced /dʒəˌnetɪk ˈdrɪft/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “A victim of drift”
- “To drift to fixation”
- “Driven by drift”
Learning
Memory Aids
Mnemonic
Think of a small boat (small population) drifting randomly on the ocean (over generations), its position (allele frequency) changing by chance, not by steering (selection).
Conceptual Metaphor
EVOLUTION IS A RIVER; GENETIC DRIFT IS RANDOM CURRENTS/EDDIES. / CHANGE IS MOVEMENT; GENETIC DRIFT IS RANDOM DRIFTING.
Practice
Quiz
Which scenario best illustrates genetic drift?