In genetics,<unk> is the degree to which a phenotype is expressed by individuals having a particular genotype. (Alternately, it may refer to the expression of particular gene by individuals having a certain phenotype.)<unk> 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 actually express the phenotype.
Expressivity 
Hysteresivity
Neurodiversity
Variegation 
Allelic heterogeneity
Heteroplasmy
Pseudodominance
Non-Mendelian inheritance