Definition of introgression in English:

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Pronunciation: /ˌɪntrə(ʊ)ˈɡrɛʃ(ə)n/


[mass noun] Biology
The transfer of genetic information from one species to another as a result of hybridization between them and repeated backcrossing.
Example sentences
  • Therefore, there is the potential for gene introgression across species via backcross of hybrid females to the parental species.
  • 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.



Example sentences
  • Plant biologists have long been comfortable with the notion that ‘good species’ can still exchange some genes via introgressive hybridization as have biologists concerned with hybrid zones.
  • Incongruence among data sets can arise from various biological processes, including introgressive hybridization, recombination, and gene conversion.
  • For instance, introgressive events, even when rare, may be more important than mutations as a source of novel genetic variability within taxa.


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

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