Several Members of the Fitzsimmons Family Have Polydactyly,and They Differ

question 36

Multiple Choice

Several members of the Fitzsimmons family have polydactyly,and they differ in their numbers of extra fingers and toes.Yet certain relatives who should have extra digits don't,such as Megan Fitzsimmons.She has two children,a son with two extra fingers and a daughter with an extra toe,and her father has an extra digit on each hand and foot.Polydactyly is

• A) variably expressive and incompletely penetrant.
• B) invariably expressive and completely penetrant.
• C) pleiotropic and a phenocopy.
• D) dominant and recessive.
• E) incompletely dominant and completely recessive.

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