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Question
During a medical investigation, an infant was found to possess an extra chromosome-21. Describe the symptoms the child is likely to develop later in the life.
Solution
An additional copy of chromosome number 21 (trisomy of 21) leads to Down's syndrome. The affected individual will have:
(i) short statured with small round head
(ii) furrowed tongue
(iii) partially open mouth
(iv) broad palm with characteristic palm crease
(v) retarded physical, psychomotor and mental development
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