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Updated: Jun 22, 2026

A Conflict Model of Reward-seeking Behavior in Male Rats

A Conflict Model of Reward-seeking Behavior in Male Rats

Published on: February 20, 2019

Intralocus sexual conflict.

G Sander van Doorn¹

¹Santa Fe Institute, Santa Fe, New Mexico 87501, USA. vandoorn@santafe.edu

Annals of the New York Academy of Sciences

|July 2, 2009

Summary

This summary is machine-generated.

Intralocus sexual conflict occurs when males and females have different trait optima, hindering evolutionary progress. This conflict influences sex chromosomes, sexual selection, and sex determination systems.

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Area of Science:

Evolutionary biology
Genetics
Sexual conflict

Background:

Intralocus sexual conflict arises from sex-specific trait optima constrained by a shared gene pool.
This can lead to negative intersexual fitness correlations and sexually antagonistic variation.
It differs from interlocus sexual conflict, which involves mating interactions.

Purpose of the Study:

To review evidence for genomewide sexually antagonistic variation.
To discuss resolutions and evolutionary consequences of intralocus sexual conflict.
To examine its role in sex chromosome evolution, sexual selection, and sex determination.

Main Methods:

Review of experimental evidence for sexually antagonistic variation.
Theoretical and empirical data analysis on conflict resolution and evolutionary impacts.

Main Results:

Substantial sexually antagonistic variation exists in Drosophila melanogaster.
Sex-specific gene regulation evolves rapidly, suggesting minor obstacles to conflict resolution.
Intralocus conflict is dynamic, impacting fitness correlations despite rapid sexual dimorphism evolution.

Conclusions:

Intralocus conflict significantly shapes sex chromosome evolution, gene expression biases, and sexual selection.
It can interfere with mate choice benefits and erode genetic gains.
Conflict plays a key role in triggering transitions between sex determination systems.