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.
Evolutionary significance of introgressive hybridization in cyprinid fishes.
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.
buzzatii by introgressive hybridization (Naveira and Fontdevila 1985), makes this complex a suitable species set for the study of the evolutionary sequence from the origin to the fixation of inversions.
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.
Genetic divergence and introgressive hybridization between Alnus sinuata and A.
Finally, I will briefly examine the problem of introgressive hybridization, which can also lead to an erroneously inferred species tree from a gene tree - specifically an mtDNA-haplotype tree.
Furthermore, recombinant genotypes are produced via backcrossing, and it is not difficult to imagine that such introgressive hybridization could provide a means for occasional movements of nuclear or cytoplasmic alleles from one species to the other in nature.