introgression
noun
in·tro·gres·sion ˌin-trə-ˈgre-shən 
: the entry or introduction of a gene from one gene complex into another (as by hybridization)
introgressant
ˌin-trə-ˈgre-sᵊnt
adjective or noun introgressive
ˌin-trə-ˈgre-siv
adjective 
Example Sentences
Recent Examples on the Web Trent University professor and geneticist Linda Rutledge acknowledges that in Ontario researchers documented some dog introgression in the genome—but just in the Y chromosome, and not much. 
Popular Science, 12 Mar. 2021
Popular Science, 12 Mar. 2021 Word History
Etymology
intro- + -gression (as in regression)
First Known Use
1938, in the meaning defined above
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