A patient presenting with severe mental retardation, seizures, ataxia and “puppet like gait” with a happy disposition prone to bouts of uncontrolled laughter is likely to have a defect in:
a) maternal chromosome 15q11-15q13
b) paternal chromosome 15q11-15q13
c) maternal chromosome 7p11-7p13
d) paternal chromosome 7p11-7p13
e) maternal chromosome 17q13-17q15

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