penetrance noun. ['pɛnɪtr(ǝ)ns] M17.
[In sense 1 from PENETRANT + -ANCE: in sense 2 from German Penetranz.]
1. The action of penetrating; penetration. rare. Only in M17.

2. Genetics. The extent to which a particular gene or set of genes is expressed in the phenotypes of individuals possessing it, measured by the proportion of carriers of the gene showing the characteristic phenotype. M20.

[TahlilGaran] English Dictionary ▲