introgressive hybridization


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introgressive hybridization

[¦in·trə¦gres·iv ‚hī·brəd·ə′zā·shən]
(genetics)
The spreading of genes of a species into the gene complex of another due to hybridization between numerically dissimilar populations and the extensive backcrossing.
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Introgressive hybridization of smallmouth bass (Micropterus dolomieu) and Guadalupe bass (M.
Phylogenetic relationships of the lamprologine cichlid genus Lepidiolamprologus (Teleostei: Perciformes) based on mitochondrial and nuclear sequences, suggesting introgressive hybridization. Molecular Phylogenetics and Evolution, v.
barbadense germplasm: molecular analysis of introgressive hybridization. Theoretical and Applied Genetics 91:1153-1161.
Cytonuclear genetic architecture in mosquitofish populations and the possible roles of introgressive hybridization. Molecular Ecology 2: 139-149.
In addition, there is evidence that introgressive hybridization may serve as a source of adaptive genetic variation (Lewontin and Birch 1966; P.
Concerns regarding the potential risks of release of transgenic organisms are focused both on the transgenic organisms themselves (i.e., development of insect resistance due to release of BT transgenics) and on the long-term impacts of introgressive hybridization of modified genes into wild relatives of the transgenics (Dale, 1994; Ellstrand and Hoffman, 1990).
Several studies have suggested that mtDNA paraphyly is the result of introgressive hybridization among taxa as diverse as wolves (Lehman et al.
Our sample of inversions induced by introgressive hybridization fit the uniform breakage probability model and their breakpoints did not show a regional clustering along the chromosomes.
Introgressive hybridization in heteroptera: the example of Limnoporus Stahl (Gerridae) species in western Canada.
Hence, mixed combinations of alternative species plumage phenotypes and mtDNA haplotypes mostly likely are due to introgressive hybridization rather than to residual historical polymorphisms.
Cases in which an individual has the organelle genotype characteristic of one taxon, but the nuclear genotype of a second, could be due to retention of an ancestral polymorphism for the organelle genotype or to introgressive hybridization. Not only might retention of ancestral polymorphism be confounded with hybridization, but both phenomena are expected to become less frequent with increasing time since divergence.