1 MCQs in Medicine for NEET PG
A 22-year-old man undergoes colonoscopy for rectal bleeding. The endoscopic image shows the appearance marked **D** — innumerable adenomatous polyps (>100) carpeting the entire colonic mucosa. Genetic testing confirms a truncating APC mutation on chromosome 5q21-22. Which of the following best explains the molecular mechanism underlying the pathognomonic polyposis phenotype seen at **D**?
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