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Quantitative genetic models of sexual selection.

Experientia

|October 15, 1985

Summary

Quantitative genetic models challenge traditional sexual selection theories, suggesting runaway sexual selection is a more plausible mechanism. Further empirical research is needed to validate these findings and understand genetic parameters.

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Area of Science:

Evolutionary Biology
Quantitative Genetics

Background:

Traditional models of sexual selection, including the handicap principle and 'sexy son' hypothesis, face challenges from quantitative genetic approaches.
The 'good genes' hypothesis may yield inaccurate conclusions regarding sexual selection dynamics.

Purpose of the Study:

To evaluate the viability of runaway sexual selection processes using quantitative genetic models.
To explore the potential of sexual selection to drive population differentiation.

Main Methods:

Application of quantitative genetic models to simulate sexual selection.
Analysis of models considering attributes in both sexes and parental care.
Examination of multi-locus models to compare with polygenic model outcomes.

Main Results:

Quantitative genetic models disprove central tenets of handicap and 'sexy son' hypotheses.
Runaway sexual selection is feasible under diverse conditions, including across environmental gradients and for parental care traits.
Sexual selection demonstrates significant potential for population differentiation, particularly in epigamic traits, influenced by evolutionary indeterminacy and environmental factors.

Conclusions:

Runaway sexual selection is a robust evolutionary process supported by theoretical models.
Empirical validation and estimation of genetic parameters are crucial for confirming runaway processes in natural populations.
Sexual selection can significantly amplify geographic variation and promote population divergence.

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