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Mutation, Gene Flow, and Genetic Drift

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).

Gene Flow

Gene Flow

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

Genetic Drift

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.

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Conservation of Small Populations

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...

Limits to Natural Selection

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.

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Related Experiment Video

Updated: Jan 7, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice Oryza sativa ssp.

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice Oryza sativa ssp.

Published on: January 28, 2020

Genetic Allee Effects for Controlling Invasive Populations.

Louis Nowell Nicolle¹, Alex Fournier-Level², Charles Robin¹

¹School of BioSciences, University of Melbourne, Parkville, Victoria, Australia.

Molecular Ecology

|January 3, 2026

Summary

This summary is machine-generated.

Introducing genetic load can create an Allee effect, reducing invasive pest establishment. This genetic strategy aids in preventing new incursions and managing invasive species populations.

Keywords:

Allee effect founder populations genetic load inbreeding invasive species pseudo‐overdominance

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Last Updated: Jan 7, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice Oryza sativa ssp.

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Published on: January 28, 2020

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Published on: May 1, 2021

Population Replacement Strategies for Controlling Vector Populations and the Use of Wolbachia pipientis for Genetic Drive

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Published on: July 4, 2007

Area of Science:

Ecology
Genetics
Invasive Species Management

Background:

Invasive pests pose significant threats to food security and ecosystems.
Early detection of small invasive populations is difficult, hindering management.
Allee effects, where population growth rate decreases at low densities, are rare in invasive species but could aid control.

Purpose of the Study:

To investigate the potential of imposing a genetic Allee effect using genetic load.
To assess how introducing deleterious recessive alleles impacts the establishment probability of small invasive founder populations.

Main Methods:

Numerical and individual-based modeling were employed.
Simulations examined populations with deleterious recessive alleles sourced from a larger invasive population.
Analysis focused on the impact of genetic load unmasked during population founding.

Main Results:

Genetic load significantly reduced the establishment probability of small invasive populations across various parameters.
Sterile mutations were more effective than lethal mutations; X-linkage provided minimal advantage over autosomal inheritance.
Distributing low-frequency deleterious alleles across many loci was more effective than high-frequency alleles across fewer loci.

Conclusions:

Imposing a genetic Allee effect through genetic load is a viable strategy to reduce invasive species establishment.
This approach can make invasive source populations less likely to establish in new environments.
Management strategies could involve pre-emptively introducing deleterious recessives into potential source populations.