Marfan syndrome is an autosomal dominant disorder associated with a mutation in collagen and resulting in skeletal, optical, and cardiovascular abnormalities. Each person with a dominant mutant allele expresses at least one of the symptoms, with varying degrees of severity. This is an example of _______.

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incomplete penetrance


a sex-influenced trait




variable expressivity


asked May 5, 2013 in Genetics by GeneX ~Top Expert~ (7,933 points)

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variable expressivity
answered May 5, 2013 by GeneX ~Top Expert~ (7,933 points)

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