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  4. Cri-du-chat syndrome in humans is caused by the-

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Q. Cri-du-chat syndrome in humans is caused by the-

AIPMTAIPMT 2006Principles of Inheritance and Variation

Solution:

Cri du chat syndrome, also called deletion 5p syndrome, (or 5p minus), is a rare genetic disorder. Cri du chat syndrome is due to a partial deletion of the short arm of chromosome number 5. The name of this syndrome is French for 'cry of the cat', referring to the distinctive cry of children with this disorder. The cry is caused by abnormal larynx development, which becomes normal within a few weeks of birth. Infants ! with cri du chat have low birth weight and may have respiratory problems. Some people with this disorder have a shortened lifespan, but most have a normal life expectancy.