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Mate choice, monogamy and mutational load.

K R McLean, J T Manning

    Journal of Theoretical Biology
    |October 7, 1985
    PubMed
    Summary
    This summary is machine-generated.

    The Haldane mutational load can be reduced by mate choice, especially for mildly deleterious mutations. This finding is crucial for understanding evolutionary constraints in species with low reproductive rates.

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    Area of Science:

    • Evolutionary genetics
    • Population genetics
    • Theoretical biology

    Background:

    • The classical Haldane mutational load, calculated as 1 - e^(-alpha), quantifies the reduction in a population's mean fitness due to new deleterious mutations.
    • This load is typically independent of heterozygote fitness and can be substantial, potentially exceeding the bearing capacity of low fecundity species given high genome-wide mutation rates (alpha = 0.9-1.8).

    Purpose of the Study:

    • To investigate the potential for mate choice to mitigate the mutational load in both polygamous and monogamous species.
    • To determine the conditions under which mate choice is most effective in reducing the genetic load.

    Main Methods:

    • Theoretical modeling of mutational load under different mating systems (polygamous and monogamous).
    • Incorporation of sexual selection, specifically female and male choosiness for mutation-free or low-mutation mates.

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    Main Results:

    • Mate choice significantly reduces the mutational load, particularly for mildly deleterious mutations.
    • The effectiveness of mate choice in load reduction is demonstrated for both polygamous and monogamous mating systems.
    • The greatest reduction in mutational load occurs when mutations are mildly deleterious and mate choice is present.

    Conclusions:

    • Sexual selection, through mate choice, can act as a powerful mechanism to reduce the burden of deleterious mutations in populations.
    • This mechanism is especially important for species with low fecundity, offering an evolutionary pathway to overcome high mutational loads.
    • The findings highlight the interplay between mutation, selection, and mating behavior in shaping genome evolution.