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Generation of Variation and Mean Fitness Increase: Necessity is the Mother of Genetic Invention

View ORCID ProfileYoav Ram, Lee Altenberg, Uri Liberman, Marcus W. Feldman
doi: https://doi.org/10.1101/229351
Yoav Ram
aDepartment of Biology, Stanford University, Stanford, CA
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Lee Altenberg
bInformation and Computer Sciences, University of Hawai‘i at Mānoa, Honolulu, HI
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Uri Liberman
cSchool of Mathematical Sciences, Tel Aviv University, Israel
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Marcus W. Feldman
aDepartment of Biology, Stanford University, Stanford, CA
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Abstract

Generation of variation may be detrimental in well-adapted populations evolving under constant selection. In a constant environment, genetic modifiers that reduce the rate at which variation is generated by processes such as mutation and migration, succeed. However, departures from this reduction principle have been demonstrated. Here we analyze a general model of evolution under constant selection where the rate at which variation is generated depends on the individual. We find that if a modifier allele increases the rate at which individuals of below-average fitness generate variation, then it will increase in frequency and increase the population mean fitness. This principle applies to phenomena such as stress-induced mutagenesis and condition-dependent dispersal, and exemplifies “Necessity is the mother of genetic invention.”

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Posted December 05, 2017.
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Generation of Variation and Mean Fitness Increase: Necessity is the Mother of Genetic Invention
Yoav Ram, Lee Altenberg, Uri Liberman, Marcus W. Feldman
bioRxiv 229351; doi: https://doi.org/10.1101/229351
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Generation of Variation and Mean Fitness Increase: Necessity is the Mother of Genetic Invention
Yoav Ram, Lee Altenberg, Uri Liberman, Marcus W. Feldman
bioRxiv 229351; doi: https://doi.org/10.1101/229351

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