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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Genetics) the introduction of genes from the gene pool of one species into that of another during hybridization
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References in periodicals archive ?
This yellow, semi-flint breeding population was developed by Rod Edmondson, Funk Seeds International, Kinston, NC, from VaCBX (Virginia-Corn Belt Exotic breeding population was developed by Clarence Genter, Blacksburg, VA) with introgressions of four elite non-Stiff Stalk inbred lines.
Introgressions of alien chromatin into wheat are usually done by X-ray induced translocations, whole arm translocations resulting from misdivision-fusion of univalents, or by induced homoeologous recombination (Knott, 1987).
Additionally, the linkage disequilibrium associated with recent introgressions can be effectively exploited to track specific alleles.
The very weak phylogeographic structure and low genetic differentiation could be a result of a recent common ancestral origin, multiple introgressions and strong genetic exchange among the indigenous cattle populations [6, 13, 25].
Introgression lines for the third chromosome were previously created [25] by repeated backcrossing of [F.sub.1] hybrids to their parent species and then by several generations of brother-sister mating, paired with molecular genotyping at every generation, to make the introgressions homozygous.
lunatus to prevent wild-domesticate introgressions. However, it is possible that several of these wild populations had contact with domesticated populations of Lima bean in the past because of the migratory characteristics of the milpa.
Furthermore, it is assumed that introgressions have occurred in this breed mainly from Indian zebu breeds in the recent millennia.
Independent introgressions of the N gene may also have been achieved by other workers, although information on the derivation and existence of this material is fragmentary (Ternovsky, 1941,1945; Goodspeed, 1942; Kostoff and Georgieva, 1944; Kostoff, 1948; Valleau, 1952; Oka, 1961).
The McGISH protocol has been used successfully to detect three whole-chromosome introgressions in MZI202.
Earlier, such artificial introgressions were mainly restricted to gene transfer between species that were cross compatible (Maan, 1987), as cross incompatibility problems prevented production of viable seeds among hybrids between unrelated species.