Sister chromatids are present during which phase of the cell cycle?

• A. Prophase
• B. G2 phase
• C. G1 phase
• D. Cytokinesis

Answer: (A)

Verified step by step guidance

1. Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2) and the mitotic phase (M phase, which includes prophase, metaphase, anaphase, and telophase). Cytokinesis is the final step where the cell divides into two daughter cells.
2. Learn about sister chromatids: Sister chromatids are identical copies of a chromosome connected by a centromere. They are formed during the S phase of interphase when DNA replication occurs.
3. Identify when sister chromatids are visible: After the S phase, sister chromatids are present but not visible until the cell enters prophase of mitosis, where they condense and become distinguishable.
4. Consider the options: Evaluate each phase mentioned in the problem (Prophase, G2 phase, G1 phase, Cytokinesis) to determine when sister chromatids are present and visible.
5. Conclude based on visibility: Sister chromatids are present and visible during prophase, as this is when they condense and prepare for separation during mitosis.