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Incomplete penetrance

From SNPedia

Carriers of a harmful gene variant or SNP, even one that is considered a dominant mutation, may not develop the associated disease. This type of mutation is said to have reduced or incomplete penetrance[1] Retinitis pigmentosa is an example of an inherited condition that may appear to "skip generations" because of reduced penetrance.[PMID 18640990]

Many additional terms are defined in the SNPedia Glossary page, including penetrance.