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Introgression

 - 2 dictionary results

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.
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Also called in⋅tro⋅gres⋅sive hybridiza⋅tion  [in-truh-gres-iv] .

Origin:
1930–35 (earlier in literal sense of L); < L intrōgress(us), ptp. of intrōgredī to go in, enter (intrō- intro- + -gred-, comb. form of grad(ī) to proceed, walk + -tus ptp. suffix, with -dt- > -ss-) + -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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in·tro·gres·sion   (ĭn'trə-grěsh'ən)   
n.  Infiltration of the genes of one species into the gene pool of another through repeated backcrossing of an interspecific hybrid with one of its parents.

[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 (-grěs'ĭv) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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