the quality or state of being expressive.
Genetics. the degree to which a particular gene produces its effect in an organism.
Compare penetrance.

1930–35; < German Expressivität. See expressive, -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expressivity (ˌɛksprɛˈsɪvɪtɪ)
1.  (esp of a work of art) the quality of being expressive
2.  genetics the strength of the effect of a gene on the phenotype

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Example sentences
Need to consider test results in the context of mutation variability, gene penetrance, and gene expressivity.
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