Which phase of mitosis is characterized by chromosomes aligning at the cell's equatorial plate?

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

Answer: (D)

Verified step by step guidance

1. Understand the question: The problem is asking about the phase of mitosis where chromosomes align at the cell's equatorial plate. This requires knowledge of the stages of mitosis and their characteristics.
2. Recall the stages of mitosis: Mitosis consists of Prophase, Metaphase, Anaphase, and Telophase. Each stage has distinct events that occur in the cell.
3. Focus on Metaphase: During Metaphase, the chromosomes are fully condensed and align at the metaphase plate (the cell's equatorial plate). This alignment is facilitated by the spindle fibers attaching to the centromeres of the chromosomes.
4. Compare with other phases: In Prophase, chromosomes condense and the nuclear envelope begins to break down. In Anaphase, sister chromatids are pulled apart to opposite poles of the cell. In Telophase, the nuclear envelope reforms around the separated chromosomes. None of these phases involve alignment at the equatorial plate.
5. Conclude that the phase characterized by chromosomes aligning at the cell's equatorial plate is Metaphase, based on the defining events of each mitotic stage.