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Updated: Dec 12, 2025

Methods for Staging Pupal Periods and Measurement of Wing Pigmentation of Drosophila guttifera
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Fly wing evolution explained by a neutral model with mutational pleiotropy.

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|August 9, 2020
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Summary
This summary is machine-generated.

Phenotypic evolution rates are not directly linked to mutation rates. This study revises models of evolutionary divergence, showing that trait evolution is influenced by stabilizing selection acting on other traits via pleiotropy.

Keywords:
Mutational variancephenotypic evolutionselection

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Genetics

Background:

  • The relationship between the rate of phenotypic variation production and the pace of long-term evolution is a key question.
  • Previous studies suggested a linear link between mutational variance and evolutionary rates, posing challenges for existing models.

Purpose of the Study:

  • To re-evaluate the relationship between mutational variance and phenotypic evolution rates.
  • To test existing models of phenotypic evolution against empirical data on fly wing morphology.
  • To propose an alternative explanation for observed evolutionary patterns.

Main Methods:

  • Analysis of mutational variances, additive genetic variances, and macroevolution of fly wing vein intersections.
  • Statistical modeling to assess relationships between trait variation and evolutionary rates.
  • Reinterpretation of existing data within established theoretical frameworks.

Main Results:

  • The previously reported linear relationship between mutational variance and evolutionary divergence was found to be artifactual.
  • Fly wing traits appear effectively neutral within certain phenotypic ranges.
  • Evolutionary rates are modulated by pleiotropic effects of mutations on traits under stabilizing selection.

Conclusions:

  • Existing models of phenotypic evolution can explain observed patterns in fly wing morphology.
  • Pleiotropy, rather than direct mutation rate, is a significant factor in regulating evolutionary rates.
  • The study highlights the importance of considering indirect genetic effects in evolutionary trajectories.