Which of the following is an inherited X-linked disorder where the muscles closest to the center of the body (the hip and shoulder area) are affected first, with the muscles in the fingers being affected later?
A. developmental coordination disorder
B. Duchenne muscular dystrophy
C. cerebral palsy
D. spina bifida
ANS: B
Duchenne muscular dystrophy is an inherited sex-linked disorder caused by a genetic mutation, which results in the absence of a critical protein, dystrophin, which stabilizes the muscle membrane during contraction. When this protein is deficient, muscles degenerate.
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