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Related Concept Videos

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...
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...
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...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
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...
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.

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Related Experiment Video

Updated: Jun 25, 2026

New Variations for Strategy Set-shifting in the Rat
09:45

New Variations for Strategy Set-shifting in the Rat

Published on: January 23, 2017

Mutation-selection equilibrium in games with multiple strategies.

Tibor Antal1, Arne Traulsen, Hisashi Ohtsuki

  • 1Program for Evolutionary Dynamics, Department of Mathematics, Harvard University, Cambridge, MA 02138, USA. tibor_antal@harvard.edu

Journal of Theoretical Biology
|March 3, 2009
PubMed
Summary
This summary is machine-generated.

This study reveals simple conditions for strategy abundance in evolutionary games, applicable across mutation rates. These findings offer a complete characterization of n x n games under weak selection.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Last Updated: Jun 25, 2026

New Variations for Strategy Set-shifting in the Rat
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New Variations for Strategy Set-shifting in the Rat

Published on: January 23, 2017

Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Area of Science:

  • Evolutionary game theory
  • Population genetics
  • Mathematical biology

Background:

  • Individual fitness varies with strategy frequency in evolutionary games.
  • Understanding strategy dynamics in large, finite populations is crucial.

Purpose of the Study:

  • To analyze stochastic evolutionary dynamics under weak selection for any mutation rate.
  • To derive simple conditions for strategy abundance in mutation-selection equilibrium.

Main Methods:

  • Analysis of the frequency-dependent Moran process in well-mixed populations.
  • Exploration of stochastic evolutionary dynamics under weak selection.
  • Investigation across various mutation rates.

Main Results:

  • Identified surprisingly simple conditions for strategy abundance relative to 1/n or other strategies.
  • Derived distinct conditions for low and high mutation rates.
  • Established a linear combination of conditions valid for all mutation rates.

Conclusions:

  • Provided a complete characterization of n x n games in the limit of weak selection.
  • The derived conditions simplify the analysis of evolutionary game dynamics.
  • Results are robust across different evolutionary processes like Wright-Fisher and Pairwise Comparison.