All of the following events occur during prophase in mitosis except crossing over (Option B)
- Mitosis can be divided into four phases: prophase, metaphase, anaphase, and telophase.
- During prophase, the chromatids condense into chromosomes, thereby making them visible.
- The mitotic spindle is a structure composed of microtubule proteins that segregate the chromosomes in mitosis. This structure is formed in prophase.
- In Prophase homologous pairs of chromosomes are paired together. In metaphase, these chromosomes are lined up at the equator of the cell and sister chromatids are attached to the spindle fiber.
- Crossing over (or recombination) is the exchange of genetic material between non-sister chromatids that occurs during prophase I of meiosis.
In conclusion, condensation of DNA, the pairing of chromosomes and, spindle formation occur during prophase, whereas crossing over occurs in prophase I of meiotic cell division (Option B).
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