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Related Concept Videos

Genetic Drift03:33

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
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,...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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...
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...
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...

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Related Experiment Video

Updated: Jul 5, 2026

Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat
06:03

Procedure for Adaptive Laboratory Evolution of Microorganisms Using a Chemostat

Published on: September 20, 2016

The stochastic edge in adaptive evolution.

Eric Brunet1, Igor M Rouzine, Claus O Wilke

  • 1Laboratoire de Physique Statistique, Ecole Normale Supérieure, 75230 Paris Cedex 05, France.

Genetics
|May 22, 2008
PubMed
Summary

This study extends analysis of adaptation speed in asexual populations by refining calculations for rapid adaptation. New methods accurately model the dynamics of rare mutants, improving predictions for evolutionary processes.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Theoretical biology

Background:

  • The speed of adaptation in asexual populations is linked to the dynamics of rare mutants at the population's stochastic edge.
  • Previous models by Desai and Fisher calculated adaptation speed (1/tau) using stochastic methods but were limited to moderate adaptation speeds.

Purpose of the Study:

  • To extend the analysis of the stochastic edge dynamics for adaptation speed calculations.
  • To develop methods applicable to high adaptation speeds, overcoming limitations of prior models.

Main Methods:

  • Substantially extending Desai and Fisher's stochastic edge analysis.
  • Applying exponential or nonexponential back extrapolation from finite time to determine mean establishment time (tau).

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
04:52

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Main Results:

  • Developed methods to accurately calculate adaptation speed even at high rates.
  • Demonstrated compatibility of results with alternative analytical approaches (Rouzine et al.).
  • Validated findings through agreement with numerical simulations.

Conclusions:

  • The extended analysis provides a more robust framework for understanding adaptation speed across various rates.
  • The refined methods improve the accuracy of predicting evolutionary trajectories in asexual populations.