During which phase of mitosis are the sister chromatids pulled apart?

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

Answer: (B)

Verified step by step guidance

1. Understand the process of mitosis, which is the division of a single cell into two genetically identical daughter cells. Mitosis consists of several phases: prophase, metaphase, anaphase, and telophase.
2. Recall that sister chromatids are identical copies of a chromosome connected by a centromere. During mitosis, these chromatids need to be separated to ensure each daughter cell receives an identical set of chromosomes.
3. Review the phases of mitosis: In prophase, chromosomes condense and become visible. In metaphase, chromosomes align at the cell's equatorial plane. In anaphase, sister chromatids are pulled apart toward opposite poles of the cell. In telophase, the cell prepares to divide into two daughter cells.
4. Focus on anaphase: During this phase, the centromeres split, and the spindle fibers shorten, pulling the sister chromatids apart to opposite ends of the cell. This ensures that each new cell will have the correct number of chromosomes.
5. Conclude that the phase during which sister chromatids are pulled apart is anaphase, as this is the critical step in ensuring equal distribution of genetic material to the daughter cells.