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

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

Answer: (B)

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, also known as the metaphase plate.
2. Review the phases of mitosis: Mitosis consists of four main phases—Prophase, Metaphase, Anaphase, and Telophase. Each phase has distinct characteristics.
3. Focus on Metaphase: During Metaphase, the chromosomes, which have already condensed and attached to spindle fibers, align at the cell's equatorial plate. This alignment ensures that each daughter cell will receive an identical set of chromosomes.
4. Compare with other phases: In Prophase, chromosomes condense and spindle fibers form. In Anaphase, sister chromatids are pulled apart to opposite poles. In Telophase, the nuclear envelope reforms around the separated chromosomes. None of these phases involve alignment at the equatorial plate.
5. Conclude: Based on the characteristics of each phase, the phase where chromosomes align at the equatorial plate is Metaphase.