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Which of the following is an example of point mutation? 

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Which of the following is an example of point mutation? 

(a) Down syndrome 

(b) Sickle-cell anaemia 

(c) Cri-du chat syndrome 

(d) Haemophilia

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Correct option: (b) Sickle-cell anaemia

The sickle-cell anaemia is an example of point mutation. A point mutation is a genetic mutation where a single nucleotide base is changed, inserted or deleted from a sequence of DNA.

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