Also found in: Medical.


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) genetics resulting from, marked by, or bringing about introgression
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Introgressive hybridization and the evolution of lake-adapted catostomid fishes.
Molecular analysis of introgressive breeding in coffee (Coffea arabica L.).
Bidirectional introgressive hybridization between a cattle and human schistosome species.
Untangling the evolutionary history of a highly polymorphic species: introgressive hybridization and high genetic structure in the desert cichlid fish Herichtys minckleyi.
Zhang (2011) suggested that there is introgressive hybridization between P.
crassidens females would be valuable, because a bias at this point could influence introgressive asymmetry.
Introgressive hybridization between bighead care and silver carp in the Mississippi and Illinois Rivers.
Limited realized dispersal and introgressive hybridization influence genetic structure and conservation strategies for brown rockfish, Sebastes auriculatus.