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Down’s syndrome is caused by non-disjunction of 21st chromosome i.e. Trisomy.

1. Turner’s syndrome
2. Klinefelter’s syndrome
3. Down’s syndrome
4. Sickle cell anaemia

Correct answer: Down’s syndrome

Solution

Down’s syndrome is the classic result of trisomy 21, meaning there are three copies of chromosome 21 due to nondisjunction. The other options are caused by different chromosomal or gene-level abnormalities.

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