Which description matches the first phase of mitosis, where the genetic material condenses and duplicated chromosomes become visible?

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Multiple Choice

Which description matches the first phase of mitosis, where the genetic material condenses and duplicated chromosomes become visible?

Explanation:
During mitosis, the first stage is prophase, where the genetic material condenses from thread-like chromatin into visible chromosomes. Each chromosome has been replicated into two sister chromatids held together at the centromere, so they appear as x-shaped structures under the microscope. The nucleolus fades, and the nuclear envelope begins to break down as the spindle apparatus starts to form outside the nucleus. This setup of condensed chromosomes and the forming spindle is what distinguishes the first phase from the later stages, where chromosomes align, separate, and new nuclei form.

During mitosis, the first stage is prophase, where the genetic material condenses from thread-like chromatin into visible chromosomes. Each chromosome has been replicated into two sister chromatids held together at the centromere, so they appear as x-shaped structures under the microscope. The nucleolus fades, and the nuclear envelope begins to break down as the spindle apparatus starts to form outside the nucleus. This setup of condensed chromosomes and the forming spindle is what distinguishes the first phase from the later stages, where chromosomes align, separate, and new nuclei form.

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