Transgressive segregation, adaptation and speciation

@article{Rieseberg1999TransgressiveSA,
  title={Transgressive segregation, adaptation and speciation},
  author={Loren H. Rieseberg and Margaret A. Archer and Robert K. Wayne},
  journal={Heredity},
  year={1999},
  volume={83},
  pages={363-372}
}
The production of extreme or ‘transgressive’ phenotypes in segregating hybrid populations has been speculated to contribute to niche divergence of hybrid lineages. Here, we assess the frequency of transgressive segregation in hybrid populations, describe its genetic basis and discuss the factors that best predict its occurrence. From a survey of 171 studies that report phenotypic variation in segregating hybrid populations, we show that transgression is the rule rather than the exception. In… 
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It is shown that the genetic architecture of the cichlid jaw limits transgression, whereas the genetic basis of skull shape is permissive of transgressive segregation, which suggests that natural selection will limit the degree of diversity that may be achieved via hybridization.
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It is demonstrated that genome-wide SNP analysis facilitated detection of genetic loci associated with the extreme phenotypes and revealed that the transgressive phenotypes were produced by exchanging complementary alleles of a few minor QTLs in the similar parental genotypes.
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Significant effects of hybrid cross, test environment, and cross × environment interactions suggest that the amount of transgression produced in a hybrid cross is highly context specific and that outcomes of hybridization differ even among crosses made from the same two parents.
Introgressive hybridization and morphological transgression in the contact zone between two Mediterranean Solea species
TLDR
The morphological variation patterns associated with introgressive hybridization between two species of sole, Solea senegalensis and Solea aegyptiaca, are investigated to document the building of reproductive isolation and the possible emergence of transgressive phenotypes that can be a source of evolutionary novelties.
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