nonpenetrance

non·pen·e·trance

(non-pen'ĕ-trants),
The state in which a genetic trait, although present in the appropriate genotype (that is, homozygous, hemizygous, or heterozygous according to the state of dominance and mode of inheritance), fails to manifest itself in the phenotype because of modifying factors. Compare: hypostasis.
Farlex Partner Medical Dictionary © Farlex 2012

non·pen·e·trance

(non-pen'ĕ-trăns)
The state in which a genetic trait, although present in the appropriate genotype, fails to manifest itself in the phenotype because of nongenetic mechanisms.
Compare: hypostasis
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Secondly, in some individuals, evidently having appropriate genotype, some marked phenotype anomalies may be absent (nonpenetrance).