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Cell Division – Explore Learning Activity Phases of the Cell Cycle: 1.a.Cells present? _______________ How does it change? ______________________ b. Sketch below as many different appearances you see. How many different cell appearances do you observe? _______ 2. a. Stage: ______________ What happens? ________________________________ Stage: ________________ What happens? ____________________________ Stage: ________________ What happens? ____________________________ b. What process relating to the cell’s DNA occurs during interphase? Why is this important? ________________________________________________________________________ ________________________________________________________________________ 3. a. What structures appear during this phase? ____________________ What structures disappear? _____________________________ b. Three parts: _____________________ ____________________ ______________ 4. What events occur during metaphase? ______________________________________ 5. a. Describe events of anaphase. ________________________________________________________________________ ________________________________________________________________________ b. At completion, how many chromatids are there at each pole? _______ How do the chromatids at one pole compare to those at the other? ____________________________ 6. a. How many cells has the original cell turned into at the completion of cytokinesis? _ b. What is true about the DNA contained in these two cells? _______________________ c. If human cells, how many chromatids are contained in each cell? ______ Relative Duration of the Phases 1. a. How many of the cells were in each of the phases at that time? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ b. Which phase had the largest number of cells? ________________________ 2. Phase with largest number of cells? ____________________ Smallest number of cells? _________________________ 3. Calculate the average number of cells in each of the five phases: interphase: _____ prophase: _____ metaphase: _____ anaphase: ______ telophase: ______ a. Phase with largest number of cells? ______________________ What does this mean about the amount of time that cells spend in this phase? ___________________________ b. Phase with smaller number of cells? ______________________ What can you conclude about the amount of time that cells spend in this phase compared to the other phases? ______________________________________________________ 4. a. How long does the average cell spend in each of the six stages? Interphase: __________ Prophase: ___________ Metaphase: __________ Anaphase: ___________ Telophase: __________ b. What part of mitosis takes the longest amount of time? ________________ Shortest amount of time? _______________ Why do you think this is? ________________________________________________________________________ ________________________________________________________________________ c. What do you think would happen if cell division occurred in an uncontrolled way? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ **Discuss your ideas with your classmates if there is time at the end of the period!**
