Abstract
FISHER'S fundamental theorem of natural selection1 states that for a random mating population with fitnesses dependent on the genetic constitution at a single locus, the mean fitness of the population increases with time. This is true for an arbitrary number of possible alleles at the locus and for arbitrary fitness values.
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References
Fisher, R. A., The Genetical Theory of Natural Selection (Oxford University Press, 1930).
Moran, P. A. P., Ann. Hum. Genet., 27, 383 (1964).
Moran, P. A. P., Proc. Fifth Berk. Symp. Math. Stat. and Prob. (Univ. California Press, 1965).
Kingman, J. F. C., Quart. J. Math., 12, 78 (1961).
Moran, P. A. P., Ann. Hum. Genet, (in the press).
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EWENS, W. Mean Fitness Increases when Fitnesses are Additive. Nature 221, 1076 (1969). https://doi.org/10.1038/2211076a0
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DOI: https://doi.org/10.1038/2211076a0
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