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Related Concept Videos

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...
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
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...
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...
Natural Selection and Adaptation01:15

Natural Selection and Adaptation

Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations, psychological...
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...

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Related Experiment Video

Updated: Jun 5, 2026

A Quantitative Fitness Analysis Workflow
11:39

A Quantitative Fitness Analysis Workflow

Published on: August 13, 2012

Visualizing and quantifying natural selection.

E D Brodie1, A J Moore, F J Janzen

  • 1Edmund Brodie III is at the Center for Ecology, Evolution and Behavior, T.H. Morgan School of Biological Sciences, University of Kentucky, Lexington, KY 40506-0225, USA.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Modern analysis methods reveal natural selection details. Multivariate statistics and graphical representations identify selection targets, aiding evolutionary change studies.

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Area of Science:

  • Evolutionary biology
  • Quantitative genetics

Background:

  • Understanding natural selection is crucial for evolutionary studies.
  • Traditional methods offer limited detail on selection processes.

Purpose of the Study:

  • To explore how modern analytical techniques enhance the study of natural selection.
  • To detail the application of multivariate statistics and graphical methods in evolutionary research.

Main Methods:

  • Utilizing multivariate statistical techniques to identify specific targets of natural selection.
  • Employing graphical representations of selection surfaces for intuitive understanding.
  • Combining quantitative and visual analyses for comprehensive insights.

Main Results:

  • Identification of specific targets of natural selection.
  • Estimation of parameters relevant to evolutionary change equations.
  • Enhanced intuitive understanding of selection forms through visual analysis.

Conclusions:

  • Modern analytical approaches provide unprecedented detail in studying natural selection.
  • The integration of quantitative and visual methods offers new insights into wild selection dynamics.
  • These advancements facilitate a deeper understanding of evolutionary mechanisms.