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Review Question - QID 108472

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QID 108472 (Type "108472" in App Search)
A 2-year-old male is referred to a geneticist for developmental delay and intellectual disability. He was hypotonic at birth and his parents are concerned that he tries to eat everything, including erasers and chalk. Physical exam is remarkable for severe obesity and hypogonadism. Genetic analysis reveals that he has one mutated allele and one normal allele at the gene of interest. Which of the following is the most likely explanation for why this patient is affected despite having a normal allele?