Also found in: Medical, Legal, Wikipedia.
Related to introgression: hybrid swarm, reticulate evolution, backcrossing


The movement or spread of alleles of one species into the gene pool of another through repeated backcrossing of interspecific hybrids with members of one of the parental species.

[From Latin intrōgressus, past participle of intrōgredī, to step in : intrō-, intro- + gradī, to step; see ghredh- in Indo-European roots.]

in′tro·gres′sive (-grĕs′ĭv) adj.


(Genetics) the introduction of genes from the gene pool of one species into that of another during hybridization
References in periodicals archive ?
Other blue mussel hybrid zones are characterized by introgression that varies extensively across loci.
The kdr mutation has also been used as a marker for monitoring introgression between the 'M' and 'S' molecular forms of An.
2004) Introgression of chukar genes into reintroduced red-legged partridge (Alectoris rufa) population in central Italy.
2], and including only those individuals with mature pods at the moment of collection), and (iv) morphological evidence of possible wild-domesticated introgression on flower, pod, or seed characters.
It will be looking at the problem of introgression of crops and wild plants and the consequences of this phenomenon.
Nonindigenous forms run the gamut from genes to species, involving intergradation, introgression and competitive replacement.
Potential environmental effects resulting from introgression
A better understanding of nuclear-cytoplasmic interactions has direct applications to plant breeding and crop improvement, such as more extensive use of alien species and more efficient gene introgression.
By comparing the relative concentrations of these markers in both the cultivar and wild populations of strawberry in and around two South Carolina farms, the extent of possible introgression was evaluated for both past and present populations.
Ecological concerns include competition of transgenic stocks with wild populations, introgression of the transgene into wild gene pools, heightened predation of transgenics on prey populations, and a range of other possible impacts.
But that focus and Smith's incredible talent for mimicry are largely absent from her latest effort, "House Arrest: An Introgression.