spontaneous mutation

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Related to natural mutation: induced mutation

spontaneous mutation

[spän′tā·nē·əs myü′tā·shən]
(genetics)
A mutation that occurs spontaneously, that is, in an individual not specifically exposed to a known mutagen.
References in periodicals archive ?
In one experiment, the team showed that male fruitflies that could not sense cVA, either because of a natural mutation or genetic engineering, could not differentiate between mated and virgin females.
However, in the late 1920s, commercial breeders stumbled across a natural mutation that caused tomatoes to ripen uniformly, from an even shade of light green to an even shade of red.
From the earlier studies, DNA sequencing of gyrA showed that all the strains possessed a natural mutation at codon Ser95Thr (AGC [right arrow] ACC) polymorphism, which did not have a significant impact on fluoroquinolone susceptibility (12,13).
It's the latest natural mutation in the region - recently 30ft-long basking sharks were spotted in waters off the Galway coast.