text: . what phase of the cell cycle are sex cells in? i know its one of these  interphase prophase metaphase anaphase telophase during the final stage of mitosis, telophase, the chromosomes decondense, becoming unorganized chromatin again. a nuclear membrane forms around each daughter set of chromosomes, and the spindle fibers disappear. sometime during telophase, the cytoplasm and cytoplasmic membrane of the cell split into two (cytokinesis), each containing one set of chromosomes residing within its nucleus.