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Related Experiment Videos

Sex differences in gene expression for pupa weight in long term selected lines of Tribolium.

F D Enfield, N Hartung, S H Hefeneider

    Canadian Journal of Genetics and Cytology. Journal Canadien De Genetique Et De Cytologie
    |March 1, 1975
    PubMed
    Summary

    Inbreeding depression significantly impacted male Tribolium progeny but not females, suggesting sex-specific gene effects on pupa weight. This highlights autosomal genes with differing dominance effects in males versus females.

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    Area of Science:

    • Population genetics
    • Quantitative genetics
    • Insect genetics

    Background:

    • Long-term artificial selection can reveal underlying genetic architectures.
    • Inbreeding depression is a common phenomenon in selected populations.
    • Sex-specific effects can complicate genetic analyses.

    Purpose of the Study:

    • To investigate the genetic basis of inbreeding depression in selected Tribolium populations.
    • To determine if gene effects on pupa weight differ between sexes.
    • To test the hypothesis of autosomal genes with sex-specific dominance.

    Main Methods:

    • Full-sib matings in Tribolium populations selected for pupa weight over 85 generations.
    • Analysis of variance (ANOVA) on backcrossed populations (Design-III).

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  • Comparison of inbreeding depression effects in male and female progeny.

    • Main Results:

    • Significant inbreeding depression observed in male progeny, but not in female progeny.
    • Analysis revealed segregating genes with dominance effects specific to males.
    • Evidence supports autosomal genes with differential dominance effects on pupa weight in males and females.

    Conclusions:

    • A class of autosomal genes influences pupa weight with sex-specific dominance.
    • Genetic architecture of quantitative traits can exhibit significant sexual dimorphism.
    • Understanding sex-specific gene effects is crucial for evolutionary and breeding studies.