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Continuous variation caused by genes with graduated effects.

S Matthysse, K Lange, D K Wagener

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1979
    PubMed
    Summary
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    This study proposes a new model for inheritance, suggesting genes have gradually decreasing effects rather than equal ones. This genetic model predicts that offspring variance depends on parental genetic values, differing from classical polygenic theory.

    Area of Science:

    • Genetics
    • Quantitative Genetics
    • Population Genetics

    Background:

    • Classical polygenic theory assumes numerous genes with small, similar effects.
    • This model underlies quantitative trait inheritance and population genetics.
    • Phenotypic distributions are often assumed to be normal.

    Purpose of the Study:

    • To propose an alternative model of inheritance with gradually decreasing gene effects.
    • To analyze the phenotypic distribution and parent-offspring genic value distribution under this new model.
    • To identify testable differences between the decreasing-effect model and the classical equal-effect model.

    Main Methods:

    • Developed a theoretical model where gene effects decrease gradually.
    • Calculated the joint distribution of parent and offspring genic values.

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  • Derived predictions for offspring phenotypic variance based on parental genic values.

    • Main Results:

    • The proposed model results in non-normal phenotypic distributions (e.g., triangular with geometric decrease).
    • Offspring variance is dependent on parental genic values in the decreasing-effect model.
    • In contrast, offspring variance is independent of parental genic values in the classical equal-effect model.

    Conclusions:

    • The decreasing-effect model offers a plausible alternative to classical polygenic theory.
    • The dependence of offspring variance on parental genic values is a key, testable prediction.
    • This model may better explain observed phenotypic distributions in certain genetic systems.