This text describes the major stages of cell growth and division. By analyzing the amount of time a human cell spends in each phase, the text explores how the probability equation can be applied to the cell cycle. Learning outcomes: 1. Students will be able to describe the major stages of the cell cycle (M, G1, S, and G2). 2. Students will be able to explain the events that occur during each major cell-cycle stage. 3. Students will be able to define probability. 4. Students will be able to calculate the probability of a cell being in interphase.