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Probability in Biology: The Case of Fitness

Millstein, Roberta L. (2012) Probability in Biology: The Case of Fitness. [Preprint]

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    Abstract

    I argue that the propensity interpretation of fitness, properly understood, not only solves the explanatory circularity problem and the mismatch problem, but can also withstand the Pandora’s box full of problems that have been thrown at it. Fitness is the propensity (i.e., probabilistic ability, based on heritable physical traits) for organisms or types of organisms to survive and reproduce in particular environments and in particular populations for a specified number of generations; if greater than one generation, “reproduction” includes descendants of descendants. Fitness values can be described in terms of distributions of propensities to produce varying number of offspring and can be modeled for any number of generations using computer simulations, thus providing both predictive power and a means for comparing the fitness of different phenotypes. Fitness is a causal concept, most notably at the population level, where fitness differences are causally responsible for differences in reproductive success. Relative fitness is ultimately what matters for natural selection.


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    Item Type: Preprint
    Additional Information: Forthcoming in The Oxford Handbook of Probability and Philosophy; the final version may deviate somewhat from this version.
    Keywords: probability, biology, fitness, natural selection, propensity interpretation, Mills, Beatty, Finsen, Gillespie, Rice
    Subjects: Specific Sciences > Biology
    Specific Sciences > Biology > Evolutionary Theory
    Specific Sciences > Probability/Statistics
    Depositing User: Dr. Roberta L. Millstein
    Date Deposited: 11 Jul 2012 01:07
    Last Modified: 11 Jul 2012 01:07
    Item ID: 9225
    URI: http://philsci-archive.pitt.edu/id/eprint/9225

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