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Natural Selection and Mating Preferences

Natural Selection and Mating Preferences

The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
Females, due to their biological roles in conception, pregnancy, and nursing,...

Types of Selection

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

Competition

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.

Mate Choice

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.

Inclusive Fitness

Inclusive Fitness

Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

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Related Experiment Video

Updated: Feb 25, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Reproductive competition and sexual selection.

Tim Clutton-Brock¹

¹Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK thcb@cam.ac.uk.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences

|August 2, 2017

Summary

This study explores methods for measuring reproductive competition and sexual selection, highlighting how social and ecological factors influence these processes in both sexes to understand the evolution of secondary sexual characters.

Keywords:

reproductive competition sex differences sexual selection

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Area of Science:

Evolutionary Biology
Behavioral Ecology
Sexual Selection Studies

Background:

Understanding sex differences in reproductive competition is crucial for evolutionary biology.
Estimating the strength of sexual selection requires robust methodologies.
The operational sex ratio and opportunity for sexual selection are key metrics.

Purpose of the Study:

To trace the evolution of methods for quantifying reproductive competition and sexual selection.
To synthesize different approaches for measuring sexual selection in males and females.
To explore the role of social and ecological factors in modifying reproductive competition.

Main Methods:

Review of methodologies assessing operational sex ratio.
Analysis of opportunity for sexual selection metrics.
Comparison of selection gradients between sexes.

Main Results:

Different approaches offer complementary insights into sex differences in reproductive competition.
Sexual selection operates differently between sexes, influencing secondary sexual character evolution.
Social and ecological conditions significantly modify reproductive competition.

Conclusions:

A comprehensive understanding of sexual selection requires integrating various measurement approaches.
Future research should focus on how environmental factors shape reproductive competition and development.
This work contributes to understanding the evolution of sex differences in reproductive strategies.