penetrance

[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

1635-45; penetr(ant) + -ance

British Dictionary definitions for penetrance

penetrance

/ˈpɛnɪtrəns/

noun

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

Word Origin

C20: from penetr(ant) + -ance, on the model of German penetranz

penetrance in Medicine

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