During what stage of mitosis are the chromosomes lined up in the middle of the cell?

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

Answer: (B)

Verified step by step guidance

1. Understand the stages of mitosis: Mitosis is divided into several stages: prophase, metaphase, anaphase, and telophase. Each stage has distinct characteristics and functions.
2. Identify the key feature of metaphase: During metaphase, chromosomes align at the metaphase plate, which is the imaginary line equidistant from the two spindle poles. This alignment is crucial for the equal separation of chromosomes.
3. Compare the stages: In prophase, chromosomes condense and become visible, and the mitotic spindle begins to form. In anaphase, sister chromatids are pulled apart toward opposite poles. In telophase, the chromosomes arrive at the poles and begin to de-condense.
4. Focus on metaphase: The defining characteristic of metaphase is the alignment of chromosomes at the cell's equatorial plane, preparing them for separation.
5. Conclude with the correct stage: Based on the alignment of chromosomes in the middle of the cell, the correct stage of mitosis is metaphase.