MCAT Question A Day - 3/20/14

The pedigree in the following diagram represents the inheritance of deaf-mutism over three generations within a family. (An arrow on a circle is a male, and a cross below a circle is a female; affected individuals have blackened circles). What kind of trait is deaf-mutism?

A. Autosomal dominant

B. Autosomal recessive

C. Sex-linked dominant

D. Sex-linked recessive

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