Akademik

Expressivity
The consistency of a genetic disease. For example, Marfan disease shows variable expressivity. Some persons with Marfan's merely have long fingers and toes while others have the full-blown disease with dislocation of the lens and dissecting aneurysm of the aorta.
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In clinical genetics, the degree of severity in which a gene is manifested.

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ex·pres·siv·i·ty .ek-.spres-'iv-ət-ē n, pl -ties the relative capacity of a gene to affect the phenotype of the organism of which it is a part compare PENETRANCE

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ex·pres·siv·i·ty (ek″sprĕ-sivґĭ-te) in genetics, the level of phenotypic expression of an inherited trait in an individual.

Medical dictionary. 2011.