Myotonic dystrophy

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The correct answer is E.

Myotonic Dystrophy (The Facts)The disease is myotonic dystrophy, which is an autosomal dominant disease; the affected gene has been localized to chromosome 19. Myotonic dystrophy is relatively common and is best thought of as a systemic disease, since it causes cataracts, testicular atrophy, heart disease, dementia, and baldness in addition to muscular weakness.

A mutation on the X chromosome (choice A) causes Duchenne muscular dystrophy.

None of the muscle diseases are known to be related to defects on the Y chromosome (choice B).

Facioscapulohumeral dystrophy is associated with a defective gene on chromosome 4 (choice C).

Infantile hypotonia has been related to defective genes on chromosome 5 (choice D).




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