1 MCQs in Psychiatry for NEET PG
A 16-year-old boy presents with a 6-month history of auditory hallucinations, paranoid delusions, and social withdrawal. On examination, he has a long narrow face, malar flatness, and hypernasal speech. Cardiac evaluation reveals tetralogy of Fallot. FISH analysis of his karyotype shows the pattern marked **A** in the diagram — a single fluorescent signal at the 22q11.2 locus on one chromosome 22, with two signals on the other chromosome 22. Which of the following best explains the psychiatric phenotype in this patient?
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