Which of the following activities occurs during anaphase of mitosis?

• A. The nuclear envelope reforms around separated chromosomes.
• B. Chromosomes align at the metaphase plate.
• C. Chromatin condenses into visible chromosomes.
• D. Sister chromatids are pulled apart toward opposite poles of the cell.

Answer: (D)

Verified step by step guidance

1. Understand the context of the question: The problem is asking about the specific activity that occurs during anaphase, which is a stage of mitosis. Mitosis is the process of cell division that ensures equal distribution of genetic material to daughter cells.
2. Recall the key events of anaphase: During anaphase, the sister chromatids (identical copies of a chromosome) are separated and pulled toward opposite poles of the cell by the spindle fibers. This ensures that each daughter cell will receive an identical set of chromosomes.
3. Eliminate incorrect options: Review the other activities listed in the question. For example, the nuclear envelope reforms during telophase, chromosomes align at the metaphase plate during metaphase, and chromatin condenses into visible chromosomes during prophase. These do not occur during anaphase.
4. Focus on the correct activity: The correct activity during anaphase is the separation of sister chromatids. This is facilitated by the shortening of spindle fibers attached to the centromeres of the chromatids.
5. Summarize the process: During anaphase, the sister chromatids are pulled apart and move to opposite poles of the cell, ensuring that each daughter cell will have an identical set of chromosomes after mitosis is complete.