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Review Question - QID 214983

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QID 214983 (Type "214983" in App Search)
A gravida 1 para 0 woman gives birth at 34 weeks of gestation to twin boys by spontaneous vaginal delivery. During delivery, 2 placentas and 2 amniotic sacs are observed. The boys are both found to have APGAR scores of 8 at 1 minute and 9 at 5 minutes. They both have blonde hair, blue eyes, and dermal melanocytosis over the sacrum. Over the next few months, one of the boys begins to develop failure to thrive and is found to have increased sodium levels in his sweat. Which of the following most likely occurred during the prenatal development of these twins?