Archives: USMLE Step 1 QBank

USMLE Step 1 Practice Questions
A 7 year old boy has suffered from progressive muscle weakness since he was 3 year old. When rising from a seated or lying position, the boy requires assistance from his upper extremities. The boy's uncle suffers from the same symptoms, and died at the age of 23 years. What type of mutation is most likely responsible for this patient's condition?

1. Chromosome duplication

2. Frame-shift mutation

3. Inversion

4. Point mutation

5. Robertsonian translocation

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May 31, 2015