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the extent to which a heritable trait is manifested by an individual carrying the principal gene or genes that determine it.


In clinical genetics, the degree of severity in which a gene is manifested.


n. pl. expressivi·ties
1. The quality of being expressive.
2. Genetics The degree to which an expressed gene produces its effects in an organism.


The degree of severity shown by an AUTOSOMAL dominant trait in any particular affected individual. The main feature of expressivity is its variability.


the degree to which a particular gene exhibits itself in the PHENOTYPE of an organism, once it has undergone PENETRANCE. Thus, for example, a penetrant baldness gene in man can have a wide range of expressivity, from thinning hair to complete lack of hair.


The extent to which an inherited trait or disease is manifested in the phenotype. It is a qualitative evaluation unlike penetrance. Syn. expression.

Patient discussion about expressivity

Q. where do the expression "going back on the wagon " come from?


Q. What role does emotion have in the life of someone with autism? I just find the whole disorder of autism hard to understand because I'm a really emotional person. I'm especially interested in how people with mild autism or Asperger's can function fine but then when it comes to feeling empathy they have such trouble. I guess my question is how such people experience emotion--are these people actually unable to care about others? My intention is not to sound ignorant, I'm genuinely curious.

A. I have asperger's and most everything for me is logically analyzed and I have a difficulty knowing what emotion goes with certain situations and how the emotion manifests itself within me.
I care about others, I just cannot always put myself in their shoes and feel what they are feeling.

More discussions about expressivity