Genetic mutations occur randomly with respect to their fitness effects
the verdict
SUPPORTED
the evidence backs this
confidence 88/100
Genetic mutations arise via random molecular processes with respect to their consequences on organismal fitness, producing distributions of outcomes that span deleterious, neutral, and occasionally beneficial effects.
Evidence for · 8
Mutation Accumulation in Populations of Varying Size: The Distribution of Mutational Effects for Fitness Correlates in <i>Caenorhabditis elegans</i>
2004 · cited by 95
Mutations are analyzed across a distribution of effects on fitness, confirming their stochastic generation relative to utility.
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More for · 7
Rate of deleterious mutation and the distribution of its effects on fitness in vesicular stomatitis virus
1999 · cited by 76
Mutational effects are measured as largely deleterious or neutral, occurring without regard to organismal need.
Fitness Effects of Mutations: An Assessment of PROVEAN Predictions Using Mutation Accumulation Data
2022 · cited by 27
Genomic prediction tools evaluate mutation effects as random relative to functional protein outcomes.
The effects of spontaneous mutation on competitive fitness in <i>Drosophila melanogaster</i>
2002 · cited by 22
Spontaneous mutations in Drosophila result in a range of fitness effects, demonstrating standard random occurrence.
Mutation bias alters the distribution of fitness effects of mutations
2025 · cited by 10
Mutation bias studies show that while spectra can shift, the baseline occurrence of mutations remains blind to directional fitness outcomes.
Mutation bias alters the distribution of fitness effects of mutations
2024 · cited by 8
Research on E. coli mutation bias demonstrates that mutation occurrence is governed by chemical and enzymatic bias rather than directed optimization.
Scaling the fitness effects of mutations with respect to differentially adapted Arabidopsis thaliana accessions under natural conditions
2023 · cited by 4
Chemical mutagenesis in Arabidopsis yields a distribution of fitness effects spanning beneficial to deleterious outcomes randomly.
Shifts in mutation bias promote mutators by altering the distribution of fitness effects
2022 · cited by 3
Mutational processes operate independently of immediate fitness requirements, establishing baseline distributions of phenotypic effects.