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Related Concept Videos

Gene Conversion02:08

Gene Conversion

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...
Gene Conversion02:08

Gene Conversion

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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Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Exon Recombination02:32

Exon Recombination

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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Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...
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Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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Chromosomal evolution and speciation: a recombination-based approach.

Kevin Livingstone1, Loren Rieseberg

  • 1Department of Biology, 142 Jordan Hall, Indiana University, Bloomington, IN 47401 USA.

The New Phytologist
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Chromosomal rearrangements may drive speciation by altering recombination rates, promoting genetic divergence even with gene flow. New data from Solanaceae supports this model of chromosomal speciation.

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Last Updated: Jun 27, 2026

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Published on: July 11, 2025

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Subcloning Plus Insertion (SPI) - A Novel Recombineering Method for the Rapid Construction of Gene Targeting Vectors
09:02

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Published on: January 8, 2015

Area of Science:

  • Evolutionary Biology
  • Genetics
  • Speciation Research

Background:

  • Karyotypic differences between species are well-documented but their causal role in speciation is debated.
  • Existing models of chromosomal speciation often rely on underdominance, which faces theoretical challenges regarding fixation probability.
  • A paradox exists where stronger underdominant barriers are less likely to become fixed.

Purpose of the Study:

  • To address the limitations of underdominance-focused models in chromosomal speciation.
  • To propose and discuss a novel model for chromosomal speciation based on recombination rate modification.
  • To present supporting empirical data for the proposed model.

Main Methods:

  • Theoretical modeling of chromosomal speciation.
  • Focus on how chromosomal rearrangements modify effective recombination rates.
  • Analysis of linkage disequilibrium dynamics under gene flow.

Main Results:

  • The proposed model suggests that rearrangements facilitate the buildup of linkage disequilibrium.
  • This process can occur in the presence of ongoing gene flow, aiding divergence.
  • Empirical data from the Solanaceae family provides support for this mechanism.

Conclusions:

  • Chromosomal rearrangements can play a causal role in speciation by modifying recombination rates, not solely through underdominance.
  • The proposed model offers a resolution to the theoretical paradoxes associated with underdominance.
  • This mechanism provides a viable pathway for the evolution of reproductive isolation driven by chromosomal changes.