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[pen-i-truh ns] /ˈpɛn ɪ trəns/
noun, Genetics.
the frequency, expressed as a percentage, with which a particular gene produces its effect in a group of organisms.
Compare expressivity (def 2).
Origin of penetrance
First recorded in 1635-45; penetr(ant) + -ance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for penetrance


(genetics) the percentage frequency with which a gene exhibits its effect
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
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penetrance in Medicine

penetrance pen·e·trance (pěn'ĭ-trəns)
The frequency, under given environmental conditions, with which a specific genotype is expressed by those individuals that possess it, usually given as a percentage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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