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Review Question - QID 212459

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QID 212459 (Type "212459" in App Search)
A 29-year-old man comes in for evaluation of infertility. He has been trying to conceive for over 2 years with his wife and previous evaluation of his wife's fertility revealed no abnormalities. Physical exam reveals a tall man with long extremities, sparse body hair, gynecomastia, and small testes. Laboratory studies reveal increased serum follicle-stimulating hormone concentration and an increased estradiol:testosterone ratio. Genetic studies reveal a cytogenetic abnormality. If this abnormality was inherited from the patient's father, at which stage of spermatogenesis did this error most likely occur?