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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).

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

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Related Experiment Video

Updated: May 31, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

Selfish genetic elements, genetic conflict, and evolutionary innovation.

John H Werren¹

¹Department of Biology, University of Rochester, Rochester, NY 14627, USA. werr@mail.rochester.edu

Proceedings of the National Academy of Sciences of the United States of America

|June 22, 2011

Summary

Selfish genetic elements (SGEs) create genetic conflict, driving evolutionary change. Understanding SGEs reveals their impact on genome structure, gene regulation, and species evolution.

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Area of Science:

Evolutionary biology
Genetics
Molecular biology

Background:

Genomes face threats from selfish genetic elements (SGEs).
SGEs promote their own transmission, potentially harming the host organism.
This creates genetic conflict within the genome.

Purpose of the Study:

To review the types of SGEs and their evolutionary consequences.
To explore how SGEs influence fundamental biological processes.
To consider the dynamics and potential functions of SGEs in evolution.

Main Methods:

Literature review of selfish genetic elements.
Analysis of evolutionary consequences of genetic conflict.
Synthesis of current research on SGE dynamics.

Main Results:

SGEs are significant drivers of evolutionary change and innovation.
SGEs shape genome structure, gene regulation, and the evolution of new genes.
SGEs play roles in speciation and the evolution of sex determination and development.

Conclusions:

Genetic conflict driven by SGEs is a key evolutionary force.
SGEs have profound impacts on genome architecture and biological complexity.
Further research into SGE dynamics may uncover novel evolutionary functions.