Short answer
A mutation changes DNA. Natural selection is the differential survival or reproduction of individuals with heritable differences. Mutation supplies some new variants; selection acts on existing variation, and a mutation need not be useful or selected. 1 2
Mutation generates genetic changes; natural selection can increase or decrease the frequency of heritable changes according to their effects in an environment.
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At a glance
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| Question | Mutation | Natural selection |
|---|---|---|
| Immediate event | DNA sequence changes | Reproductive success differs |
| Needs an advantage? | No | Advantage is context-dependent |
| Population outcome | May add a variant | Can shift variant frequency |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Mutation. A change in a DNA sequence that can create a new genetic variant. 1
Natural selection. A population process in which heritable differences affect survival or reproduction, changing variant frequencies over generations. 2
Key differences
Mutations arise through molecular processes rather than because an organism needs a particular solution. Selection depends on the environment and the effect of heritable traits on reproduction. Drift and other processes also change frequencies. 1 2
How to tell them apart
If the claim is about a new sequence change, ask about mutation. If it is about some heritable forms leaving more descendants, ask about natural selection. In a full explanation, both may occur at different stages. 1 2
Where they overlap
A mutation can create a trait variant on which selection later acts. Both contribute to evolution, but neither alone describes every evolutionary change. 1 2
Edge cases
A neutral mutation may spread through drift; a beneficial mutation can be lost by chance. Selection can also act on variation created long before the current environment. 1 2
Why the distinction exists
Evolutionary theory separates origins of variation from processes that sort variation, preventing purpose-driven stories about DNA changes. 1 2
Common misconceptions
Natural selection does not cause a targeted mutation to appear when an organism needs it. 1 2
Examples
A bacterial mutation changes a drug target; if antibiotic exposure lets carriers leave more descendants, selection raises that variant’s frequency. 1 2
Sources
Sources checked October 3, 2026.
- National Human Genome Research Institute — Mutation. Definition.
- OpenStax Biology 2e — Adaptive Evolution. 19.3 Adaptive Evolution.