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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...
Inclusive Fitness00:57

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.
What is Natural Selection?01:32

What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.The Theory of Natural...

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Related Experiment Video

Updated: Jun 5, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
09:34

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Sexual selection.

David J Hosken1, Clarissa M House

  • 1Centre for Ecology & Conservation, Biosciences, The University of Exeter, Cornwall Campus, Tremough, Penryn TR10 9EZ, Cornwall, UK. D.J.Hosken@exeter.ac.uk

Current Biology : CB
|January 25, 2011
PubMed
Summary
This summary is machine-generated.

Sexual selection, a key evolutionary mechanism, is often misunderstood. Despite claims of flaws, ample evidence supports sexual selection theory, driving current research toward complex evolutionary questions.

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Area of Science:

  • Evolutionary Biology
  • Genetics

Background:

  • Sexual selection is a core concept in evolutionary biology, frequently misunderstood and misrepresented.
  • Confusion persists regarding its definition and initial purpose, potentially influenced by societal factors.
  • Sexual selection is conceptually similar to natural selection and requires genetic variation for evolutionary change.

Purpose of the Study:

  • To clarify the concept of sexual selection and address persistent misunderstandings.
  • To refute recent claims that sexual selection theory is fundamentally flawed.
  • To highlight the robust evidence supporting sexual selection as a major evolutionary mechanism.

Main Methods:

  • Conceptual analysis of sexual selection theory.
  • Review of existing empirical evidence supporting sexual selection.
  • Examination of the relationship between sexual selection and natural selection.

Main Results:

  • Sexual selection is conceptually identical to natural selection and drives evolution with sufficient genetic variation.
  • Recent criticisms of sexual selection theory are unsubstantiated and ignore a vast body of supporting evidence.
  • The field has progressed from documenting the occurrence of sexual selection to investigating more intricate evolutionary questions.

Conclusions:

  • Sexual selection is a valid and well-supported mechanism of organic evolution.
  • Misconceptions surrounding sexual selection should be corrected to foster accurate understanding.
  • The established foundation of sexual selection theory enables advanced research into complex evolutionary processes.