A 23-Year-Old Man Is Being Evaluated for Myoclonic Epilepsy of Recent

A 23-year-old man is being evaluated for myoclonic epilepsy of recent onset.  The episodes are short-lived and triggered by startle.  Physical examination reveals proximal muscle weakness.  Gomori trichrome stain of a muscle biopsy specimen shows muscle fibers with a blotchy red appearance.  No family history is available because the patient is adopted.  What is the probability that this patient's one offspring will inherit the disease?

A) 100%
B) 75%
C) 50%
D) 25%
E) 0%

Correct Answer:

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