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Selection with partial selfing. I. Mass selection.

A J Wright, C C Cockerham

    Genetics
    |March 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Mass selection in self-pollinating populations yields different immediate and permanent genetic gains. Permanent gains from selection after reproduction are consistently higher, but immediate gains depend on the genetic model and inbreeding depression.

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    Area of Science:

    • Quantitative genetics
    • Population genetics
    • Evolutionary biology

    Background:

    • Understanding genetic gain from selection is crucial for breeding programs.
    • Self-pollination (s) influences the effectiveness of mass selection.
    • Selection timing (before vs. after reproduction) can impact genetic response.

    Purpose of the Study:

    • To formulate expected responses to mass selection in populations with partial selfing.
    • To compare immediate and permanent genetic gains based on selection timing.
    • To analyze the influence of genetic models and inbreeding depression on selection response.

    Main Methods:

    • Utilized covariances of relatives and quadratic functions for genetic models.
    • Developed a model with arbitrary additive and dominance effects.

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  • Performed numerical analysis with varying genetic parameters (allele frequencies, dominance, loci number).

    • Main Results:

    • Permanent gain from selection after reproduction is consistently (1 + s)/2 times that before reproduction.
    • Immediate gains differ between selection timings and depend on the genetic model.
    • Inbreeding depression, increasing with dominance and loci number, reduces the proportion of immediate gain retained at equilibrium.
    • Selection after reproduction generally yielded lower immediate gains retained at equilibrium.

    Conclusions:

    • The timing of mass selection significantly impacts both immediate and permanent genetic gains in self-pollinating populations.
    • Inbreeding depression plays a critical role in reducing the long-term effectiveness of immediate gains.
    • Further research is needed to quantify the impact of these phenomena in species with unknown genetic variances and inbreeding depression levels.