Final answer:
Anaphase is the third stage of mitosis where sister chromatids separate and are pulled to opposite ends of the cell. This ensures that the two new daughter cells will have identical genetic material.
Step-by-step explanation:
Anaphase is the third stage of mitosis. During anaphase, the pairs of sister chromatids are separated from each other, forming individual chromosomes once again. These chromosomes are pulled to opposite ends of the cell by their kinetochores, as the microtubules shorten. Each end of the cell receives one partner from each pair of sister chromatids, ensuring that the two new daughter cells will contain identical genetic material.