Somatic cells undergo mitosis, while germ line cells undergo another type of cell division.Mitosis consists of several phases, including karyokinesis and cytokinesis.Karyokinesis, the division of the nucleus, has four phases: prophase, metaphase, anaphase, and telophase.During prophase, the genetic material in the nucleus condenses into highly ordered structures called chromosomes, consisting of two sister chromatids.