How does penetrance differ from expressivity?
A) expressivity is dependent on environment;penetrance is not
B) expressivity is qualitative (presence or absence);penetrance is quantitative
C) penetrance involves multiple genes;expressivity involves a single gene
D) penetrance is qualitative (presence or absence);expressivity is quantitative
E) penetrance is dependent on environment;expressivity is not

Question

Quizplus · Accepted Answer

Penetrance refers to the percentage of individuals with a particular genotype who exhibit the expected phenotype. It is therefore qualitative, as it is based on whether or not the phenotype is present. Expressivity, on the other hand, refers to the degree or severity of the phenotype. This can vary from individual to individual, and is therefore quantitative.

How Does Penetrance Differ from Expressivity