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Related Concept Videos

Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Conservation of Small Populations02:04

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 likely to...
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...
Conservation of Declining Populations02:07

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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,...
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...

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Related Experiment Video

Updated: Jun 10, 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

Using underdominance to bi-stably transform local populations.

Philipp M Altrock1, Arne Traulsen, R Guy Reeves

  • 1Research Group for Evolutionary Theory, Max-Planck-Institute for Evolutionary Biology, August-Thienemann-Str. 2, D-24306 Plön, Germany.

Journal of Theoretical Biology
|August 10, 2010
PubMed
Summary

Underdominance can reverse genetic modifications in populations by controlling migration rates. This offers a reversible method for genetic pest management, particularly for disease vector species.

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Area of Science:

  • Population Genetics
  • Evolutionary Biology

Background:

  • Underdominance describes natural selection against heterozygous genotypes.
  • Genetic modification of wild populations is crucial for pest management.

Purpose of the Study:

  • To analyze a two-population underdominant system with migration.
  • To determine conditions for reversing genetic modifications in local populations.

Main Methods:

  • Mathematical modeling of a single-locus underdominant system.
  • Analysis of allele frequency dynamics under migration.
  • Approximation of critical migration rates for population transformation.

Main Results:

  • Underdominance allows for reversible genetic modification of populations.
  • Migration rate critically controls population transformation and stability.
  • Asymmetric fitness and migration can destabilize the system.

Conclusions:

  • Underdominance offers a controllable and reversible strategy for genetic modification.
  • This approach is promising for genetic pest management, especially for disease vectors.
  • Migration rate is a key factor in achieving stable, reversible population transformations.