USMLE Step 1 Quiz
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GENETICS
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A 7-year-old boy is referred for evaluation due to learning difficulties and a cheerful, overly friendly demeanor. He is highly verbal and social with strangers. Physical examination shows a flattened nasal bridge, a long philtrum, and a wide smile with widely spaced teeth. A cardiology consultation reveals supravalvular aortic stenosis.
This patient's condition is most likely caused by a microdeletion on which of the following chromosomes?
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