<Li> In addition, some cells that do not divide often or ever, enter a stage called G (Gap zero), which is either a stage separate from interphase or an extended G . </Li> <P> The duration of time spent in interphase and in each stage of interphase is variable and depends on both the type of cell and the species of organism it belongs to . Most cells of adult mammals spend about 20 hours in interphase; this accounts for about 90% of the total time involved in cell division . Interphase includes G1, S, and G2 phases . Mitosis and cytokinesis, however, are separate from interphase . </P> <P> When G is completed, the cell enters a relatively brief period of nuclear and cellular division, composed of mitosis and cytokinesis, respectively . After the successful completion of mitosis and cytokinesis, both resulting daughter cells re-enter G of interphase . </P> <P> In the cell cycle, interphase is preceded by telophase and cytokinesis of the M phase . In alternative fashion, interphase is sometimes interrupted by G phase, which, in some circumstances, may then end and be followed by the remaining stages of interphase . After the successful completion of the G checkpoint, the final checkpoint in interphase, the cell proceeds to prophase, or in plants to preprophase, which is the first stage of mitosis . </P>

Define interphase and describe what happens during this part of the cell cycle