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    The Panaxia dominula populations were undergoing natural ... — Carmelics
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    The Panaxia dominula populations were undergoing natural selection, not genetic drift

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    1 reason against

    Reasons For

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    • 1.Fisher's fundamental theorem establishes that variance in fitness within a population directly predicts the rate of evolutionary change via selection.
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    • 2.Sheppard and Fisher's own analysis of Panaxia showed medionigra allele fitness differentials large enough to produce observed frequency shifts deterministically.
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    • 3.When selection coefficients are sufficiently strong relative to population size, drift becomes causally negligible even in small populations.
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    Reason for 2 of 2
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    • 1.Elliott Sober's distinction between selection-for and drift requires that drift explanations invoke population size as the primary explanatory variable.
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    • 2.If frequency changes track environmental variables like predation pressure across generations rather than population size, selection is the better-supported causal explanation.
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    • 3.Kettlewell and Ford's long-term Panaxia data showed directional trends correlated with ecological variables, not the random walk pattern characteristic of drift.
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    Reasons Against

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    • 1.The fluctuations of gene frequencies across generations were too large to be accounted for by genetic drift
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    • 2.The size of the gene frequency fluctuations did not differ between small and large populations, contrary to what drift would predict
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    Related

    Elliott Sober's distinction between selection-for and drift requires that drift ...Fisher's fundamental theorem establishes that variance in fitness within a popul...If frequency changes track environmental variables like predation pressure acros...Kettlewell and Ford's long-term Panaxia data showed directional trends correlate...
    +4 moreShow less
    Sheppard and Fisher's own analysis of Panaxia showed medionigra allele fitness d...The fluctuations of gene frequencies across generations were too large to be acc...The size of the gene frequency fluctuations did not differ between small and lar...When selection coefficients are sufficiently strong relative to population size,...

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    Source

    AI-extracted1/3 agreementValid
    SEP: genetic-drift
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    Another important set of studies is of the polymorphic Scarlet Tiger Moth, Panaxia dominula (see Provine 1986 for extended discussion, to which the following is indebted). Fisher and Ford deliberately chose P. dominula because of its small population sizes, figuring that if they could make the case for selection against drift in its worst case, they could make a decisive case against Wright, who they saw as advocating a form of nonadaptive evolution. But rather than trying to make a case for sel
    Extraction notes

    Validity: Extracted via Max plan + API grounding/validity checks

    Details

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    claim
    Perspectives
    3 (2 for, 1 against)
    Edits
    1 edit