#august2020mccqe1
A 12-year-old boy has a particular genetic disease. His mother is a carrier of the mutated gene, but his father is not clinically affected and is not a carrier. The man has four siblings: a sister and a brother who are not clinically affected and are not carriers; a sister who is a carrier but is not clinically affected; and a brother who is clinically affected. This inheritance pattern is consistent with which of the following diseases?
(A) Alpha1-antitrypsin deficiency
(B) Cystic fibrosis
(C) Duchenne muscular dystrophy
(D) Phenylketonuria
(E) Tay-Sachs disease
A 12-year-old boy has a particular genetic disease. His mother is a carrier of the mutated gene, but his father is not clinically affected and is not a carrier. The man has four siblings: a sister and a brother who are not clinically affected and are not carriers; a sister who is a carrier but is not clinically affected; and a brother who is clinically affected. This inheritance pattern is consistent with which of the following diseases?
(A) Alpha1-antitrypsin deficiency
(B) Cystic fibrosis
(C) Duchenne muscular dystrophy
(D) Phenylketonuria
(E) Tay-Sachs disease
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