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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Curr Opin Genet Dev. 2017 Sep 12;47:48–53. doi: 10.1016/j.gde.2017.08.009

Figure 1. Penetrance and expressivity of traits.

Figure 1

In the case of a monogenic disease, all individual carrying the causal allele are expected to develop the same trait. However, in some cases, individuals with the causal allele do not express the expected phenotype, resulting in incomplete penetrance. For other traits, the phenotype will be expressed differentially in different individuals: some will develop more severe symptoms while others display milder symptoms thus representing phenotypic expressivity.