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Related Concept Videos

Gene Flow02:39

Gene Flow

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
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Mutation, Gene Flow, and Genetic Drift01:09

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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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Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
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Overview
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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.
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Related Experiment Video

Updated: Mar 1, 2026

Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR

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NEUTRAL GENE FLOW ACROSS SINGLE LOCUS CLINES.

Sergey Gavrilets1,2, Mitchell B Cruzan1,3

  • 1Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, 37996-1610.

Evolution; International Journal of Organic Evolution
|June 1, 2017
PubMed
Summary
This summary is machine-generated.

Fertility selection and assortative mating are more effective at blocking neutral gene flow than reduced hybrid viability. Testing F1 hybrids is crucial for understanding introgression barriers in species.

Keywords:
Gene flowgenetic barrierhybrid zonesmathematical models

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Understanding the genetic barriers to gene flow is crucial for speciation.
  • Neutral gene flow is influenced by various factors including selection and isolation.

Purpose of the Study:

  • To investigate the relative effectiveness of different genetic barriers in preventing neutral gene flow.
  • To assess the role of viability selection, fertility selection, and premating isolation.

Main Methods:

  • Developed a general one-locus, two-allele model.
  • Incorporated adult and pollen migration scenarios.
  • Analyzed theoretical outcomes of different selection pressures.

Main Results:

  • Fertility selection and assortative mating are more potent barriers to neutral introgression than reduced hybrid viability.
  • The model highlights the significance of post-zygotic and pre-zygotic isolation mechanisms.

Conclusions:

  • Experimental studies should prioritize testing F1 hybrids alongside parental forms to accurately gauge introgression barriers.
  • Findings provide insights into the genetic architecture of reproductive isolation and speciation.