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The evolution of genetic diversity.

B C Clarke

    Proceedings of the Royal Society of London. Series B, Biological Sciences
    |September 21, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Frequency-dependent selection, driven by interactions with predators, parasites, and competitors, offers a robust explanation for the extensive genetic variation observed in natural populations, resolving long-standing evolutionary problems.

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    Area of Science:

    • Evolutionary Biology
    • Population Genetics

    Background:

    • Natural populations exhibit substantial genetic variation in molecular and morphological traits, posing an evolutionary puzzle.
    • Previous explanations like neutral theory and heterozygous advantage face significant challenges.
    • The persistence of genetic diversity requires a compelling evolutionary mechanism.

    Purpose of the Study:

    • To propose and provide evidence for frequency-dependent selection as a unifying explanation for genetic variation.
    • To address the limitations of existing theories in explaining observed genetic diversity.
    • To demonstrate how frequency-dependent selection can account for various forms of variation.

    Main Methods:

    • Review and synthesis of evidence from predator-prey dynamics, parasite evolution, competition ecology, and molecular enzyme kinetics.

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  • Theoretical exploration of frequency-dependent selection's implications for polymorphism and continuous variation.
  • Analysis of its applicability to diverse organisms, including haploid and self-fertilizing species.

    • Main Results:

    • Evidence strongly supports the pervasive role of frequency-dependent selection in natural populations.
    • This selection mechanism arises naturally from ecological and molecular interactions.
    • Frequency-dependent selection explains both conventional polymorphism and continuous variation in molecular and morphological traits.

    Conclusions:

    • Frequency-dependent selection provides a powerful resolution to the problem of genetic variation in natural populations.
    • It accounts for diversity across different organisms and genetic systems.
    • This framework offers a more comprehensive understanding of evolutionary processes driving diversity.