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penetrance

[pen-i-truh ns]
noun Genetics.
  1. the frequency, expressed as a percentage, with which a particular gene produces its effect in a group of organisms.Compare expressivity(def 2).
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Origin of penetrance

First recorded in 1635–45; penetr(ant) + -ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for penetrance

penetrance

noun
  1. genetics the percentage frequency with which a gene exhibits its effect
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Word Origin

C20: from penetr (ant) + -ance, on the model of German penetranz
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

penetrance in Medicine

penetrance

(pĕnĭ-trəns)
n.
  1. The frequency, under given environmental conditions, with which a specific genotype is expressed by those individuals that possess it, usually given as a percentage.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.