Definition of introgression in English:



  • [mass noun] The transfer of genetic information from one species to another as a result of hybridization between them and repeated backcrossing.

    • ‘This would rule out scenarios of numt evolution involving horizontal transfer or introgression between species.’
    • ‘In the absence of selection against genetic introgression, the incipient species should fuse.’
    • ‘Therefore, there is the potential for gene introgression across species via backcross of hybrid females to the parental species.’
    • ‘The two populations allow for a comparative phenotypic analysis of species-specific genome introgressions in a common genetic background.’
    • ‘To introduce desirable genes from blue catfish into channel catfish through introgression, a genetic linkage map is helpful.’


Mid 17th century: from Latin introgredi step in, from intro- to the inside + gradi proceed, walk, on the pattern of egression, ingression.