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The evolution of sexes.

R F Hoekstra

    Experientia. Supplementum
    |January 1, 1987
    PubMed
    Summary

    The evolution of sexual reproduction, specifically mating types and anisogamy, is explored. Theoretical models suggest strong selection forces for mating type evolution, but empirical evidence is lacking, highlighting the need for experimental research.

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    Area of Science:

    • Evolutionary biology
    • Population genetics
    • Sexual reproduction

    Background:

    • Sexual differentiation into mating types likely preceded anisogamy.
    • Studying mating type evolution in isogamous populations offers insights into sex determination.
    • Anisogamy evolution is a secondary problem concerning gamete dimorphism.

    Purpose of the Study:

    • To analyze the theoretical evolution of mating types and anisogamy.
    • To evaluate proposed selection forces driving these evolutionary processes.
    • To identify research gaps and the need for experimental validation.

    Main Methods:

    • Theoretical analysis using population genetic models.
    • Review of existing theories on mating type and anisogamy evolution.
    • Assessment of comparative and empirical evidence.

    Main Results:

    • Mating types may evolve due to gamete recognition selection or intragenomic conflict, but require strong selection.
    • Anisogamy theories involve trade-offs between gamete productivity and zygote size.
    • Alternative anisogamy explanations include pheromone-mediated partner finding, but lack firm evidence.

    Conclusions:

    • Current theoretical explanations for mating type and anisogamy evolution face challenges due to required strong selection or lack of evidence.
    • Significant experimental work is critically needed in both mating type and anisogamy evolution research.

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