introgression

in·tro·gres·sion

 (ĭn′trə-grĕsh′ən)

n.

The movement or spread of alleles of one species into the gene pool of another through repeated backcrossing of interspecific hybrids with members of one of the parental species.

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[From Latin intrōgressus, past participle of intrōgredī, to step in : intrō-, intro- + gradī, to step; see ghredh- in Indo-European roots.]

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in′tro·gres′sive (-grĕs′ĭv) adj.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

introgression

(ˌɪntrəˈɡrɛʃən)

n

(Genetics) the introduction of genes from the gene pool of one species into that of another during hybridization

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