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penetrance Syllabification: pen·e·trance
Pronunciation: /ˈpenətrəns/

Definition of penetrance in English:


The extent to which a particular gene or set of genes is expressed in the phenotypes of individuals carrying it, measured by the proportion of carriers showing the characteristic phenotype.
Example sentences
  • Because of reduced penetrance, individuals of different genotypes can have the same phenotype.
  • With the exception of the relatively rare high penetrance, single gene disorders, genetic tests differ little from most other medical tests, providing evidence of statistical risk only.
  • High penetrance susceptibility genes probably account for no more than 5-10% of cases.


1930s: from German Penetranz.

Definition of penetrance in:
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