A) fertilisation of an \[\text{XX}\] egg by a normal \[\text{Y-}\]bearing sperm
B) loss of half of the short arm of hromosome5
C) loss of half of the long aim of chromosome 5
D) trisomy of 21st chromosome
Correct Answer: B
Solution :
Cri-du-chat (cat cry) syndrome in human is caused by the deletion of short arm of chromosome 5. The affected new born cries like mewing of cat. The trisomy of 21st chromosome causes Down's syndrome (mongolism).
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