Answer the questions that follow for each stage of the cell cycle (G_1, S, G_2, prophase, metaphase, anaphase, telophase). If necessary, use an arrow to indicate a change that occurs during a particular cell cycle stage (for example, 1 rightarrow 2 or yes rightarrow no). a. How many chromatids comprise each chromosome during this stage? b. Is the nucleolus present? c. Is the mitotic spindle organized? d. Is the nuclear membrane present?