Sister chromatids of each chromosome in a cell are separated to opposite poles during which phase of mitosis?

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

Answer: (A)

Verified step by step guidance

1. Understand the process of mitosis: Mitosis is the division of a eukaryotic cell's nucleus into two genetically identical nuclei. It consists of several phases: prophase, metaphase, anaphase, and telophase.
2. Recall the role of sister chromatids: Sister chromatids are identical copies of a chromosome that are joined together at a region called the centromere. During mitosis, these chromatids are separated to ensure each daughter cell receives an identical set of chromosomes.
3. Review the events of each mitotic phase: In prophase, chromosomes condense and spindle fibers form. In metaphase, chromosomes align at the metaphase plate. In anaphase, sister chromatids are pulled apart to opposite poles. In telophase, the nuclear envelope reforms around the separated chromatids.
4. Focus on anaphase: During anaphase, the spindle fibers shorten, pulling the sister chromatids apart at the centromere. This ensures that each pole of the cell receives one copy of each chromosome.
5. Conclude that the phase where sister chromatids are separated to opposite poles is anaphase, based on the description of mitotic events.