Myotonic dystrophy
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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 b
aldness 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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