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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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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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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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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Gene flow happens.

Anne D Yoder

    Evolutionary Anthropology
    |March 5, 2014
    PubMed
    Summary

    Genomics advancements offer new insights into the long-standing species problem. Researchers are nearing a unified theory of speciation genomics, improving species concepts and recognition.

    Area of Science:

    • Evolutionary Biology
    • Genomics
    • Speciation

    Background:

    • The species problem, a long-standing debate in biology, has persisted for over 150 years.
    • Despite numerous efforts, a definitive solution remains elusive.
    • The field is revisiting the species problem with renewed focus.

    Purpose of the Study:

    • To assess progress in resolving the species problem.
    • To highlight the impact of the genomics revolution on speciation research.
    • To explore the potential for a unified theory of speciation genomics.

    Main Methods:

    • Review of existing literature and ongoing research in speciation.
    • Analysis of advancements driven by the genomics revolution.
    • Synthesis of current understanding of species concepts and recognition.
    Keywords:
    Biological Species Conceptgenomic islandsselection

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    Main Results:

    • Significant progress has been made in understanding species concepts and recognition.
    • The genomics revolution has provided powerful new tools and perspectives.
    • Researchers are approaching a unified theory of speciation genomics.

    Conclusions:

    • The species problem, while historically challenging, is seeing substantial progress.
    • Genomic insights are crucial for advancing speciation theory.
    • A unified theory of speciation genomics is on the horizon.