introgression

 [in-truh-gresh-uhn]  

in·tro·gres·sion

   [in-truh-gresh-uhn]
noun Genetics.
the introduction of genes from one species into the gene pool of another species, occurring when matings between the two produce fertile hybrids.
Also called in·tro·gres·sive hybridiza·tion  [in-truh-gres-iv] .

Origin:
1930–35 (earlier in literal sense of L); < Latin intrōgress(us), past participle of intrōgredī to go in, enter (intrō- intro- + -gred-, combining form of grad(ī) to proceed, walk + -tus past participle suffix, with -dt- > -ss-) + -ion
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
introgression (ˌɪntrəˈɡrɛʃən)
 
—n
the introduction of genes from the gene pool of one species into that of another during hybridization

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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