During interphase, DNA replicates and centrioles divide in preparation for cell division. In prophase, chromatin condenses into chromosomes and the mitotic spindle begins to form. In prometaphase, the nuclear envelope breaks down and spindle fibers attach to chromosomes. In metaphase, chromosomes align at the center. In anaphase, chromatids separate and move toward opposite poles. In telophase, chromatids reach the poles. Cytokinesis then cleaves the cell into two daughter cells to complete the process.