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Related Concept Videos

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...
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...
The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Socioemotional Experience and Gender Development01:30

Socioemotional Experience and Gender Development

Social-emotional experiences and cultural influences play significant roles in shaping gender development. During middle childhood, from ages 6 to 11, peer groups become dominant in reinforcing gender norms. Children in this age group often align with same-gender peer groups, which actively encourage behaviors that conform to traditional gender roles. For instance, boys may be discouraged from engaging in activities perceived as feminine, reinforcing culturally dictated norms about masculinity...
Relationship Formation02:12

Relationship Formation

What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...
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...

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Related Experiment Video

Updated: May 26, 2026

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern
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Social evolution: evolving sex ratios.

Edward Allen Herre1, David M Shuker, Stuart A West

  • 1Smithsonian Tropical Research Institute, DPO AA 34002-9998, USA. herrea@si.edu

Current Biology : CB
|December 24, 2011
PubMed
Summary
This summary is machine-generated.

Experimental evolution in spider mites confirmed predictions from Hamilton's Local Mate Competition Theory. This study highlights evolutionary theory as a powerful, quantitatively predictive scientific framework.

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Last Updated: May 26, 2026

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology

Background:

  • Hamilton's Local Mate Competition (LMC) Theory provides a framework for understanding sex ratio evolution.
  • Predicting sex ratios is crucial for understanding mating systems and reproductive strategies.

Purpose of the Study:

  • To experimentally test the quantitative predictions of LMC Theory.
  • To compare empirically derived sex ratios with theoretical predictions in a model organism.

Main Methods:

  • Utilizing experimental evolution to manipulate populations of spider mites.
  • Quantitatively measuring the sex ratios produced under controlled evolutionary conditions.

Main Results:

  • Observed sex ratios closely matched the predictions derived from LMC Theory.
  • Experimental evolution successfully generated populations conforming to theoretical expectations.

Conclusions:

  • The study validates the predictive power of evolutionary theory.
  • LMC Theory is a robust tool for quantitatively forecasting sex ratio evolution in specific ecological contexts.