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Determine the correctness or otherwise of the following Assertion $[\text{a}]$ and the Reason $\text{[r]}$.

Assertion $\text{[a]}$: Chromosome mutations can change the structure of chromosomes.

Reason $\text{[r]}$ : All chromosome mutations arise due to nondisjunction of chromosomes during mitosis or meiosis.

  1. Both $\text{[a]}$ and $\text{[r]}$ are false
  2. $\text{[a]}$ is true but $\text{[r]}$ is false
  3. Both $\text{[a]}$ and $[\mathrm{r}]$ are true and $[\mathrm{r}]$ is the correct reason for $\text{[a]}$
  4. Both $\text{[a]}$ and $[\mathrm{r}]$ are true but $[\mathrm{r}]$ is not the correct reason for $\text{[a]}$

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