Drag the labels onto the diagram to identify the stages of the cell cycle. Most of the cell's life is spent in interphase, when growth occurs. Cells that are about to divide replicate their DNA. ? At metaphase, the mitotic spindle is fully formed and chromosomes are lined up in the center of the cell. ? In telophase chromosomes become less condensed and new nuclear envelopes form. In cytokinesis the cytoplasm divides. ? In anaphase, sister chromatids separate and become full-fledged chromosomes that move to opposite poles. ? Reset Help In prophase microtubules form the mitotic spindle, and the nuclear envelope breaks up. ?