Posted: September 21st, 2017

A child has recently been diagnosed with Duchenne’s muscular dystrophy. The parents are receiving genetic counseling prior to planning another pregnancy. Which of the following statements includes the most accurate information?

A child has recently been diagnosed with Duchenne’s muscular dystrophy. The parents are receiving genetic counseling prior to planning another pregnancy. Which of the following statements includes the most accurate information?

A. Duchenne’s is an X-linked recessive disorder, so daughters have a 50% chance of being carriers and sons a 50% chance of developing the disease.
B. Duchenne’s is an X-linked recessive disorder, so both daughters and sons have a 50% chance of developing the disease.
C. Each child has a 1 in 4 (25%) chance of developing the disorder.
D. Sons only have a 1 in 4 (25%) chance of developing the disorder.

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