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Related Experiment Videos

Selection and polygenic characters.

M Slatkin

    Proceedings of the National Academy of Sciences of the United States of America
    |May 1, 1970
    PubMed
    Summary
    This summary is machine-generated.

    This study models how selection affects continuously varying traits. It reveals limits on phenotypic diversity and niche breadth within populations, even under density-dependent selection.

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    Area of Science:

    • Evolutionary Biology
    • Quantitative Genetics
    • Mathematical Modeling

    Background:

    • Phenotypic variation is crucial for adaptation.
    • Understanding the constraints on phenotypic diversity is essential for evolutionary studies.

    Purpose of the Study:

    • To develop a mathematical model for selection on polygenic traits.
    • To investigate the limits of phenotypic diversity and niche breadth.

    Main Methods:

    • Development of a mathematical model.
    • Analysis of selection effects on continuously varying characters.
    • Inclusion of density-dependent selection.

    Main Results:

    • A limit exists for the standard deviation of phenotypic characters.

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  • This limit is related to the expected offspring deviation from parental types.
  • Phenotypic diversity and niche breadth are constrained by selection.

    • Conclusions:

    • Mathematical models can predict limits on phenotypic variation.
    • Density-dependent selection also imposes constraints on diversity.
    • Selection itself can influence these diversity limits.