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Hybridization, GeneticGenetic SpeciationCrosses, GeneticReproductionZygoteMosaicismMacrocephalyReproductive IsolationPlant InfertilityTetrahymena thermophilaUniparental DisomyChimeraSex ChromosomesX ChromosomeSpecies SpecificityInfertilityEpistasis, GeneticTrisomyBiological EvolutionModels, GeneticDrosophilaSocial IsolationSelection, GeneticMeiosisQuantitative Trait LociChromosome MappingPhenotypeAllelesGenetic MarkersCell NucleusMutationPatient Isolation
Reproductive isolationIsolating mechanismsGenomicEcologicalSpeciesGenetic
Reproductive isolation8
  • The establishment of hybrid species requires the development of reproductive isolation against parental species. (wikipedia.org)
  • In some cases hybrids may evolve into new hybrid species with reproductive isolation to both parent taxa. (wikipedia.org)
  • Understanding factors involved in maintaining stable hybrid zones is important for predicting the ultimate fate of the interacting taxa, but the relative importance of mechanisms such as ecological selection and intrinsic reproductive isolation remains unclear. (mcmaster.ca)
  • Most studies of reproductive isolation in hybrid zones have focused either on zones with strongly bimodal patterns in genotype or phenotype frequencies, with relatively strong isolation, or unimodal zones with relatively weak isolation, whereas less is known about more intermediate classes of hybrid zone. (mcmaster.ca)
  • Together, these results indicate a role for a combination of factors including assortative mating and/or early hybrid inviability in the maintenance of this hybrid zone and suggest that hybrid zones with intermediate levels of reproductive isolation are likely to be maintained by multiple interacting isolating mechanisms. (mcmaster.ca)
  • Ecological divergence without geographic isolation, as an early speciation process that may lead finally to reproductive isolation through natural selection, remains a captivating topic in evolutionary biology. (bvsalud.org)
  • I. Biological species are defined by reproductive isolation. (easynotecards.com)
  • D) Their reproductive isolation from each other is complete. (easynotecards.com)
Isolating mechanisms1
  • Hybrid sterility is one of the earliest postzygotic isolating mechanisms to evolve between two recently diverged species. (elifesciences.org)
Genomic1
  • Here, we review the mechanisms of intrinsic postzygotic isolation from genic, chromosomal, genomic, and epigenetic perspectives across diverse taxa. (bvsalud.org)
Ecological3
  • However, both types of hybrids can become further reproductively isolated, gaining extrinsic isolation barriers, by exploiting novel ecological niches, relative to their parents. (wikipedia.org)
  • Here, we present evidence that Brachypodium stacei, an annual and highly selfing grass model species, has undergone sympatric ecological divergence without geographic isolation. (bvsalud.org)
  • A role of ecological adaptation in speciation can be obscured by stochastic processes and differences that species accumulate after genetic isolation. (bvsalud.org)
Species2
  • Allopolyploid species often have strong intrinsic reproductive barriers due to differences in chromosome number, and homoploid hybrids can become reproductively isolated from the parent species through assortment of genetic incompatibilities. (wikipedia.org)
  • This could potentially lead to reinforcement, selection to strengthen premating isolation or if the species fail to evolve premating isolation, it could increase their extinction risk due to wasted reproductive effort. (wikipedia.org)
Genetic2
  • Intrinsic postzygotic isolation typically appears as reduced viability or fertility of interspecific hybrids caused by genetic incompatibilities between diverged parental genomes. (bvsalud.org)
  • Recent research has, however, suggested that the genetic basis of intrinsic postzygotic isolation can be more complex and involves, for example, overall divergence of the DNA sequence or epigenetic changes. (bvsalud.org)