Final answer:
Mitosis is the process of cell division in which the nucleus of a eukaryotic cell divides into four phases: prophase, metaphase, anaphase, and telophase. The phase characterized by the separation of sister chromatids is anaphase.
Step-by-step explanation:
Mitosis is the process of cell division in which the nucleus of a eukaryotic cell divides. In a tissue culture for normal cells, mitosis occurs in four phases: prophase, metaphase, anaphase, and telophase. The phase that is characterized by the separation of sister chromatids is anaphase.