During which phase of mitosis does the cell have a single line of chromosomes aligned at the equatorial plane?

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

Answer: (A)

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 characteristics and roles in cell division.
2. Identify the key feature of metaphase: During metaphase, chromosomes are aligned at the cell's equatorial plane, also known as the metaphase plate. This alignment ensures that each daughter cell will receive an identical set of chromosomes.
3. Differentiate between the phases: In prophase, chromosomes condense and become visible, and the nuclear envelope begins to disintegrate. In anaphase, sister chromatids are pulled apart to opposite poles of the cell. In telophase, the nuclear envelope re-forms around the separated chromatids, now called chromosomes.
4. Focus on the alignment of chromosomes: The unique feature of metaphase is the alignment of chromosomes along the equatorial plane, which is crucial for the equal distribution of genetic material.
5. Conclude with the identification of the phase: Based on the characteristic alignment of chromosomes at the equatorial plane, the phase of mitosis being described is metaphase.