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assortative mating

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noun Animal Behavior, Psychology.
  1. the reproductive pairing of individuals that have more traits in common than would likely be the case if mating were random (contrasted with disassortative mating).
Compare panmixia.

Origin of assortative mating

First recorded in 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
assortative mating in Medicine

assortative mating

(ə-sôrtə-tĭv)
n.
  1. Nonrandom mating in which individuals mate preferentially according to phenotype.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.