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Related Concept Videos

Evolutionary Processes in Microbes01:26

Evolutionary Processes in Microbes

Microbial evolution occurs rapidly due to short generation times and a variety of genetic processes, including horizontal gene transfer, mutation, recombination, and genetic drift. These mechanisms collectively enable microbes to adapt swiftly to changing environments.Horizontal gene transfer (HGT) allows genes to move between different species and occurs through three main mechanisms: conjugation, transformation, and transduction. Conjugation involves direct cell-to-cell contact for DNA...
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,...
Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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...
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...
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...

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Related Experiment Video

Updated: Jul 10, 2026

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

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Which evolutionary processes influence natural genetic variation for phenotypic traits?

Thomas Mitchell-Olds1, John H Willis, David B Goldstein

  • 1Department of Biology, BOX 90338, Duke University, Durham, North Carolina 27708, USA. tmo1@duke.edu

Nature Reviews. Genetics
|October 19, 2007
PubMed
Summary

Understanding the evolutionary forces driving phenotypic variation is key. Research explores adaptive evolution, genetic drift, and selection across species, with new methods combining ecological and genetic data to reveal insights into natural genetic variation.

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genomics

Background:

  • Phenotypic variation within and among populations is shaped by evolutionary processes.
  • Selective (e.g., adaptive evolution, balancing selection) and stochastic (e.g., genetic drift) forces play roles, but their relative importance remains debated.
  • Studies in humans, animals, and plants have advanced understanding of these forces within species.

Purpose of the Study:

  • To synthesize current knowledge on the evolutionary processes influencing phenotypic variation.
  • To explore emerging generalizations and contrasting patterns across diverse organisms.
  • To highlight the potential of new technical advances in this field.

Main Methods:

  • Review of theoretical and empirical studies on evolutionary forces.
  • Analysis of patterns across different taxa (humans, animals, plants).
  • Integration of ecological selection measurements with population genetic analysis of Quantitative Trait Loci (QTLs).

Main Results:

  • Progress has been made in understanding the role of evolutionary forces within species.
  • Tentative generalizations and contrasting patterns across species are emerging.
  • New technical approaches combining ecological and genetic data show promise.

Conclusions:

  • The relative importance of selective and stochastic processes for phenotypic variation is still being clarified.
  • Cross-species comparisons are beginning to reveal broader evolutionary principles.
  • Advancements in integrating ecological and genetic data are crucial for future discoveries in natural genetic variation.