AIIMS November 2011 – MCQ 122

A mentally retarded child can have Down’s syndrome due to all except?
A. Deletion of 21st chromosome
B. Trisomy of 21st chromosome
C. Robertsonian translocation
D. Mosaic

Please contribute to the discussion by posting the answer with references and pointing out the errors in the question!

One Comment

Akram minhaz November 18, 2011

answer.. deletion of 21th chromosome…

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