The event that only occurs in mitosis among the options provided is:
Two genetically identical diploid cells are produced.
This is characteristic of mitosis, which results in two daughter cells that are genetically identical to the parent cell and to each other.
For the other options:
- Crossing over occurs is associated with meiosis, specifically during prophase I, not mitosis.
- The nuclear envelope breaks down during prophase occurs in both mitosis and meiosis.
- Gametes are produced is also specific to meiosis.
Thus, the correct answer is: Two genetically identical diploid cells are produced.
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