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Related Concept Videos

Natural Selection and Mating Preferences01:06

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, inherently...
Mate Choice01:20

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.
Types of Selection01:46

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...
Frequency-dependent Selection01:21

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.Positive Frequency-Dependent SelectionIn positive...
Close Relationships and Culture01:29

Close Relationships and Culture

Culture shapes how people approach attraction, choose partners, and build long-term relationships. While some preferences in mate selection appear consistent across cultures, such as men valuing physical attractiveness and women emphasizing financial resources, cultural contexts influence how these preferences are expressed and prioritized. Marriage extends beyond romantic ideals in many societies and is deeply embedded in social, economic, and religious frameworks.The Role of Culture in Mate...
Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...

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Related Experiment Video

Updated: Jun 22, 2026

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae
05:39

Determination of the Mating Efficiency of Haploids in Saccharomyces cerevisiae

Published on: December 2, 2022

Sexual selection and mating systems.

Stephen M Shuster1

  • 1Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011-5640, USA. stephen.shuster@nau.edu

Proceedings of the National Academy of Sciences of the United States of America
|June 17, 2009
PubMed
Summary
This summary is machine-generated.

Sexual selection drives evolutionary change by influencing mating success. A new quantitative framework measures fitness variance and trait correlations to predict sexual dimorphism and classify mating systems.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Genetics

Background:

  • Sexual selection is a major evolutionary force shaping phenotypes.
  • Darwin recognized the importance of mating systems in influencing sexual selection.
  • Previous analyses focused on genetic relationships or mate numbers.

Purpose of the Study:

  • To develop a quantitative methodology for analyzing sexual selection and mating systems.
  • To integrate genetic and life history data for a comprehensive understanding.
  • To predict sexual dimorphism and floral morphology.

Main Methods:

  • Measuring the sex difference in the variance in relative fitness.
  • Analyzing phenotypic and genetic correlations underlying reproductive traits.
  • Integrating data on fertilization distributions.

Main Results:

  • The methodology predicts the degree and direction of sexual dimorphism.
  • It allows classification of mating systems using existing data.
  • It can predict floral morphology in plants.

Conclusions:

  • This empirical framework identifies selective forces and genetic architectures.
  • It complements studies of nucleotide variation and quantitative trait expression.
  • The methodology offers a testable and interpretable approach to evolutionary change.