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Sexual selection and fertility.

Theoretical Population Biology

|February 1, 1983

Summary

This summary is machine-generated.

Genetic models show sexual and fertility selection can maintain genetic diversity. Fertility selection significantly impacts equilibrium points, especially with preferential mating in females, influencing trait frequencies.

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Area of Science:

Evolutionary genetics
Population genetics
Behavioral ecology

Background:

Sexual selection and fertility selection are key evolutionary forces.
Understanding how these forces interact is crucial for explaining genetic diversity.
Previous models often studied these forces in isolation.

Purpose of the Study:

To analyze genetic models combining sexual and fertility selection.
To investigate the influence of selection acting on different sexes and genotypes.
To explore the maintenance of polymorphisms under these combined selective pressures.

Main Methods:

Development of genetic models incorporating sexual and fertility selection.
Analysis of selection acting on dominant/recessive alleles and homozygous/heterozygous genotypes.

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Examination of equilibrium frequencies under varying selection scenarios and mating preferences.

Main Results:

Polymorphisms can be maintained by a balance between sexual and fertility selection.
Fertility selection generally has a stronger effect on equilibrium than viability selection.
Preferential mating in females (≥20%) significantly alters equilibrium frequencies based on where fertility selection acts.

Conclusions:

Combined sexual and fertility selection can maintain genetic polymorphisms.
Fertility selection is a potent force in determining evolutionary equilibrium.
Models provide testable predictions for empirical data, such as ladybird beetle mating behaviors.