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Related Concept Videos

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 Population Genetics?01:25

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.While some alleles of a given gene might be observed commonly, other variants...
Genetic Variation01:25

Genetic Variation

Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Gene Flow02:39

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...
Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

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Related Experiment Video

Updated: Jun 4, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

Phase variation: how to create and coordinate population diversity.

Marjan W van der Woude1

  • 1Centre for Immunology and Infection, Hull York Medical School and the Department of Biology, University of York, York, UK. marjan.vanderwoude@york.ac.uk

Current Opinion in Microbiology
|February 5, 2011
PubMed
Summary

Phase variation creates diverse phenotypes in bacterial populations through DNA methylation and recombination. Recent genomic analysis reveals new regulatory variants and their integration with cellular processes.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Phase variation generates phenotypic heterogeneity within clonal bacterial populations.
  • Known mechanisms include slipped strand mispairing, site-specific recombination, and DNA methylation.
  • Understanding these variations is crucial for microbial adaptability.

Purpose of the Study:

  • To review recent advances in understanding the regulation of phase variation.
  • To highlight new regulatory variants identified through genome sequencing.
  • To discuss the integration of phase variation with cellular regulatory networks.

Main Methods:

  • Genome sequence analysis for identifying novel regulatory variants.
  • Review of literature on molecular mechanisms of phase variation.
  • Integration of findings with cellular processes and regulatory networks.

Main Results:

  • Identification of new regulatory variants driving phase variation.
  • Demonstration of phase variation's integration with cellular growth and regulatory networks.
  • Advancement in identifying phase variation events directly from genomic data.

Conclusions:

  • Recent genomic approaches facilitate the discovery of novel phase variation mechanisms.
  • Phase variation is intricately linked with broader cellular regulatory systems.
  • Continued research deepens our understanding of microbial phenotypic plasticity.