Mitosis Wheel

Mitosis Wheel Cells form new cells by a process called cell division or mitosis. During mitosis, one cell divides in half to form two new cells. Suppose you could watch a cell divide. You could see that the cell parts called chromosomes move around the cell during mitosis. Because chromosomes move in particular ways, you could arrange the events of mitosis into several steps. Biologists have been able to arrange the events of mitosis into several steps. They examined many dividing cells in order to learn the steps. What are the steps of cell division? In what order do they occur? Objective: In this exercise, you will: a. Create a visual aide to understand the steps of mitosis. b. Compare and contrast between plant and animal cells. Materials: 2 pieces of different colored construction paper 1 brass fasteners scissors glue diagram handouts colored pencils Part 1 - Define the following keywords in Table 1. Table 1 Chromosomes ______________________________________________________________________ ______________________________________________________________________ Spindle Fibers ______________________________________________________________________ ______________________________________________________________________ Centrioles ______________________________________________________________________ ______________________________________________________________________ Centromere ______________________________________________________________________ ______________________________________________________________________ Nuclear Membrane ______________________________________________________________________ ______________________________________________________________________ Chromatin ______________________________________________________________________ ______________________________________________________________________ Cell Plate ______________________________________________________________________ ______________________________________________________________________ Daughter Cells ______________________________________________________________________ ______________________________________________________________________ Cytokinesis ______________________________________________________________________ ______________________________________________________________________ Part 2 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Creating a Mitosis Wheel Refer to Template 1. Cut along the outer circle pattern. Trace the large circle pattern onto the light colored piece of construction paper. Transfer the marks on the larger disc onto the outer edge of your circle. Cut along the inner circle of the pattern piece and trace this onto the darker colored construction paper. Cut out the window portion of the smaller circle. Start by making a small cut in the middle of the window and cut straight out to each corner, then trim away the paper inside the window by cutting along the lines. Try to center the smaller circle to the larger circle and push a brass fastener through the central point of the wheel. Bend the prongs of the fastener back behind the larger wheel to keep the wheels together. Label the stages of mitosis in the middle of each subdivision of the larger disk. The stages of mitosis are the following: Interphase, Prophase, Metaphase, Anaphase, Telophase and Cytokinesis (daughter cells) Refer to Template 2. Cut out the pictures of the mitotic stages and glue them into the upper portion of the window in each stage. Inside each window write important facts about each stage of mitosis. Label and decorate the outer circle Part 3 Analysis and Conclusion Questions: 1. What part is present in plant cells but absent in animal cells? __________________________________________________________________________________ 2. What happens to the chromosome material during interphase? __________________________________________________________________________________ 3. In which phase of mitosis is a nucleus visible? __________________________________________________________________________________ 4. What happens to the chromosome material during prophase? __________________________________________________________________________________ __________________________________________________________________________________ 5. In which phase of mitosis do you first see fibers? __________________________________________________________________________________ ________________________________________________________________________________ 6. In which phase of mitosis do the fibers begin to disappear? __________________________________________________________________________________ __________________________________________________________________________________ 7. What is the role of the spindle fibers? __________________________________________________________________________________ __________________________________________________________________________________ 8. Doubled chromosomes first become visible in which phase of mitosis and how many doubled chromosomes are visible in this phase? __________________________________________________________________________________ __________________________________________________________________________________ 9. What is happening to the doubled chromosomes during Anaphase and Telophase? __________________________________________________________________________________________ __________________________________________________________________________ 10. How many cells does each dividing cell form? __________________________________________________________________________________________ __________________________________________________________________________ 11. What forms between the cells after the doubled chromosomes have pulled apart in plant cells? __________________________________________________________________________________ __________________________________________________________________________________ 12. Match the following by writing the correct letter in the proper blank. __________Interphase __________Prophase __________Metaphase __________Anaphase __________ Telophase a. b. c. d. e. Membranes around the nucleus disintegrate Doubled chromosomes separate Spindle fibers re-appear and nuclear envelope reforms DNA replication and nucleus is present Chromosomes line up in the middle of the cell Teachers Initial for Completion of the wheel ____________________