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Central Equilibria in Multilocus Systems. II. Bisexual Generalized Nonepistatic Selection Models.

S Karlin, U Liberman

    Genetics
    |April 1, 1979
    PubMed
    Summary
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    This study examines central Hardy-Weinberg (H-W) equilibria in multilocus bisexual systems. It finds that H-W polymorphism stability in bisexual models matches monoecious models under specific recombination conditions.

    Area of Science:

    • Population Genetics
    • Evolutionary Biology
    • Mathematical Biology

    Background:

    • Builds upon prior work on central equilibria in multilocus systems.
    • Focuses on Hardy-Weinberg (H-W) type equilibria in bisexual populations.
    • Investigates the impact of generalized nonepistatic selection and recombination.

    Purpose of the Study:

    • To analyze the existence and stability of central H-W equilibria in multilocus bisexual systems.
    • To explore the influence of sex-specific linkage and selection on H-W polymorphism.
    • To compare selection-recombination interactions in monoecious versus dioecious systems.

    Main Methods:

    • Mathematical modeling of multilocus bisexual genetic systems.
    • Analysis of stability conditions for H-W equilibria.

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  • Comparison of stability under different scenarios of sex-dependent selection and recombination.

    • Main Results:

    • Stability conditions for H-W polymorphism in bisexual models align with monoecious models when recombination is the average of male and female distributions.
    • Sex-dependent selection can be represented by an equivalent monoecious selection regime, a weighted combination of male and female selection.
    • The study establishes a framework for comparing selection-recombination interactions in monoecious and dioecious systems when both are sex-dependent.

    Conclusions:

    • Sex-specific factors in recombination and selection significantly influence the stability of genetic equilibria.
    • The findings provide insights into the evolutionary dynamics of sexual populations.
    • The research clarifies the relationship between monoecious and dioecious models under complex genetic forces.