Expressivity (genetics)

In genetics, expressivity is the degree to which a phenotype is expressed by individuals having a particular genotype. Alternatively, it may refer to the expression of a particular gene by individuals having a certain phenotype. Expressivity is related to the intensity of a given phenotype; it differs from penetrance, which refers to the proportion of individuals with a particular genotype that share the same phenotype.[1]

  1. ^ Miko I (2008). "Phenotype variability: penetrance and expressivity". Nature Education. 1 (1): 137.
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