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Related Experiment Videos

Environmental and genetical contributions to class difference: a model experiment.

J M Thoday, J B Gibson

    Science (New York, N.Y.)
    |February 13, 1970
    PubMed
    Summary

    Selective breeding in flies demonstrated that 42% of the variation in bristle number between groups was due to genetic factors. This highlights the significant role of heredity in quantitative trait evolution.

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    Genetic variation at the alcohol dehydrogenase locus in Drosophila melanogaster in relation to environmental variation: Ethanol levels in breeding sites and allozyme frequencies.

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    Letters to and from the editor.

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    TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·2013
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    Causes and functions of genetic variety.

    The Eugenics review·2011

    Area of Science:

    • * Evolutionary biology
    • * Quantitative genetics
    • * Animal breeding

    Background:

    • * Understanding the genetic basis of phenotypic variation is crucial in evolutionary studies.
    • * Quantitative traits, like bristle number in flies, are influenced by multiple genes and environmental factors.

    Purpose of the Study:

    • * To investigate the heritability of bristle number in flies under controlled environmental conditions.
    • * To quantify the genetic component contributing to differences between selected fly populations.

    Main Methods:

    • * Flies were categorized into two groups based on bristle count.
    • * Groups were subjected to differing temperature environments across nine generations.
    • * Offspring were selectively bred, either remaining in their parental group or transferred based on bristle number.

    Main Results:

    • * After nine generations, 42% of the difference in bristle number between the two groups was attributed to genetic factors.
    • * A significant portion of the variation within each group's bristle count was identified as genetic phenomena.

    Conclusions:

    • * Genetic variation plays a substantial role in the divergence of quantitative traits like bristle number.
    • * Selective breeding combined with environmental manipulation can effectively reveal the genetic architecture of complex traits.

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