113. A 16-year-old boy is brought to the physician for a routine - TopicsExpress



          

113. A 16-year-old boy is brought to the physician for a routine examination. He has a lifelong history of developmental delays and unusual movements such as hand flapping. He has a meager vocabulary. Two maternal uncles have mental retardation. Physical examination shows coarse facial features and macro-orchidism. DNA testing shows an expansion of a trinucleotide repeat. The patient comes from a family of four daughters. If the parents appear healthy, on average how many of their daughters are most likely carriers of this gene mutation? (A) 0 (B) 1 (C) 2 (D) 3 (E) 4 Answer:C
Posted on: Tue, 30 Jul 2013 19:41:27 +0000

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