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Related Concept Videos

Formation of Species01:31

Formation of Species

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Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
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Gene Flow02:39

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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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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Related Experiment Video

Updated: Nov 21, 2025

Manipulation of Ploidy in Caenorhabditis elegans
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Adaptive introgression: how polyploidy reshapes gene flow landscapes.

Roswitha Schmickl1,2, Levi Yant3

  • 1Department of Botany, Faculty of Science, Charles University, Benátská 2, Prague, 128 01, Czech Republic.

The New Phytologist
|January 17, 2021
PubMed
Summary
This summary is machine-generated.

Whole genome duplication (WGD) can reduce reproductive barriers, enabling gene flow between species. This process, particularly in Arabidopsis, allows polyploids to adapt to environmental challenges by acting as

Keywords:
adaptationevolutiongenomicsintrogressionpolyploidy

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Plant science

Background:

  • Whole genome duplication (WGD), leading to polyploidy, is increasingly recognized for its role in facilitating gene flow between species in both plants and animals.
  • Evidence suggests WGD can break down reproductive isolation, promoting interspecies genetic exchange.
  • Recent studies highlight adaptive and specific gene flow potentiated by WGD in response to environmental and intracellular pressures.

Purpose of the Study:

  • To investigate the role of WGD in breaking down reproductive barriers and facilitating adaptive gene flow.
  • To explore the mechanistic basis of WGD-mediated easing of species barrier strength.
  • To understand how polyploids act as 'allelic sponges' for environmental adaptation.

Main Methods:

  • Population genomic studies in wild, outcrossing species like Arabidopsis arenosa and Arabidopsis lyrata.
  • Analysis of gene flow dynamics in diploid and polyploid populations.
  • Investigation of the role of parental genome dosage in the endosperm.

Main Results:

  • WGD potentiates adaptive and highly specific gene flow in response to environmental and intracellular challenges.
  • The primary mechanism for reduced species barriers appears to be the relative dosage of parental genomes in the endosperm.
  • Diploid to polyploid gene flow and gene flow between polyploids contribute to polyploid adaptability.

Conclusions:

  • WGD-mediated breakdown of reproductive barriers, coupled with gene flow, enhances the adaptive potential of polyploids.
  • Polyploids can function as 'allelic sponges,' increasing their capacity to respond to challenging environments.
  • Understanding these mechanisms is crucial for comprehending plant and animal evolution and adaptation.