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.
n. , pl. , -ties . The quality of being expressive. Genetics . The degree to which an expressed gene produces its effects in an organism.
Definition of EXPRESSIVITY. 1: the relative capacity of a gene to affect the phenotype of the organism of which it is a part . 2: the quality of being expressive
expressivity /exÂ·presÂ·sivÂ·iÂ·ty/ (eksâ€³pres-sivÂ´Ä-te) in genetics, the extent to which an inherited trait is manifested by an individual.
noun 1. the quality or state of being expressive. 2. Genetics . the degree to which a particular gene produces its effect in an organism. Compare penetrance . Origin ...
Penetrance and Expressivity By Leos Kral. P enetrance and expresivity are two concepts that are different yet related. They are often confused for one another.