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Heterosis or neutrality?

G A Watterson

    Genetics
    |April 1, 1977
    PubMed
    Summary

    Population homozygosity effectively tests for selection neutrality, revealing heterozygote advantage or disadvantage. Sample homozygosity is a useful statistic when only sample data are available for analysis.

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    Genetical research·1987

    Area of Science:

    • Population genetics
    • Evolutionary biology
    • Quantitative genetics

    Background:

    • Numerous statistical tests exist to assess if alleles at a genetic locus are selectively neutral.
    • These ad hoc statistics often lack a strong theoretical foundation when selection is present.

    Purpose of the Study:

    • To evaluate population homozygosity as a powerful statistical test for deviations from genetic neutrality.
    • To analyze the impact of heterosis (heterozygote advantage) on genetic diversity and allele frequency distributions.

    Main Methods:

    • The study considers population genetic models incorporating selection.
    • It analyzes the properties of population and sample homozygosity as test statistics.
    • Numerical examples illustrate the application of the proposed test.

    Main Results:

    • Population homozygosity is identified as a potent statistic for detecting departures from neutrality, specifically indicating heterozygote advantage or disadvantage.
    • Sample homozygosity demonstrates similar utility when analyzing sample data.
    • Heterosis influences key genetic parameters like allele numbers and homozygosity levels.

    Conclusions:

    • Population and sample homozygosity provide robust statistical frameworks for neutrality testing in the face of selection.
    • Understanding the effects of heterosis is crucial for interpreting genetic diversity and allele frequencies in populations.

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