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What is the difference between expressivity and penetrance?

April 26, 2017expressivity penetrance

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What is the difference between expressivity and penetrance?

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Expressivity means that for a given genotype (usu. homozygous mutant) the severity of the phenotype varies, so there are several phenotypes for one genotype. Penetrance is a measure of how many of a given genotype express the [single] corresponding phenotype. III.