expressivity
ex.pres.siv.i.ty \.ek-.spres-'iv-*t-e-\ n 1: the relative capacity of a gene to modify the organism of which it is a part 2: the quality of being expressive
ex.pres.siv.i.ty \.ek-.spres-'iv-*t-e-\ n 1: the relative capacity of a gene to modify the organism of which it is a part 2: the quality of being expressive