Final answer:
Anaphase is the phase in mitosis where sister chromatids split and move to opposite ends of the cell, ensuring identical genetic material in new daughter cells.
Step-by-step explanation:
In mitosis, anaphase begins abruptly with the synchronous splitting of each chromosome into its sister chromatids. The process of mitosis ensures that two new daughter cells receive identical genetic material. During anaphase, sister chromatids are separated to form individual chromosomes, which are then pulled to opposite ends of the cell. This action is facilitated by the kinetochores and the shortening of microtubules. As a result, each pole gets one partner from each pair of sister chromatids, guaranteeing that each new daughter cell will have an identical set of chromosomes, crucial for maintaining genetic continuity.