Number of chromosomes can increase or decrease due to

Mutation

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Genetic repetition

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Nondisjunction

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All the above

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Solution

The correct option is C Nondisjunction
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. Nondisjunction causes errors in chromosome number, such as trisomy 21 (Down syndrome) and monosomy X (Turner syndrome).
So, the correct answer is 'Nondisjunction'.

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