In which phase of mitosis do the chromosomes unwind and the nuclear membrane reform?

• A. Metaphase
• B. Prophase
• C. Anaphase
• D. Telophase

Answer: (D)

Verified step by step guidance

1. Understand the stages of mitosis: Mitosis is divided into several phases: prophase, metaphase, anaphase, and telophase. Each phase has distinct events that occur within the cell.
2. Recall the events of telophase: During telophase, the chromosomes that have been separated move to opposite ends of the cell. This is the phase where the chromosomes begin to de-condense or unwind.
3. Identify the reformation of the nuclear membrane: In telophase, the nuclear membrane reforms around each set of chromosomes at the two poles of the cell, creating two separate nuclei.
4. Differentiate from other phases: In prophase, the nuclear membrane breaks down and chromosomes condense. In metaphase, chromosomes align at the cell's equator. In anaphase, sister chromatids are pulled apart. None of these phases involve the unwinding of chromosomes and reformation of the nuclear membrane.
5. Conclude that telophase is the phase where chromosomes unwind and the nuclear membrane reforms, completing the process of mitosis and preparing the cell for cytokinesis.