Penetrance vs. Expressivity

Penetrancenoun

The quality or state of being penetrant; power of entering or piercing; penetrating power.

Penetrancenoun

(genetics) The proportion of individuals carrying a particular variation of a gene that also express an associated trait

Penetrancenoun

The quality or state of being penetrant; power of entering or piercing; penetrating power or quality; as, the penetrancy of subtile effluvia.

Penetrance

Penetrance in genetics is the proportion of individuals carrying a particular variant (or allele) of a gene (the genotype) that also express an associated trait (the phenotype). In medical genetics, the penetrance of a disease-causing mutation is the proportion of individuals with the mutation who exhibit clinical symptoms among all individuals with such mutation.

Expressivitynoun

(uncountable) The quality of being expressive.

Expressivitynoun

(genetics) The degree to which a gene affects or can affect an organism.