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Mitosis Lab. Name__________________________________ Date_______________________ Each student should turn in a separate report. In a growing plant root, the cells at the tip are constantly dividing. You will observe cells going through mitosis in both plant roots and in animal cells. 1. Observe the onion root tip under low power. Write your observations below. 2. Switch to medium power. Describe what you see. 3. Change to the high power objective. Focus well with the fine adjustment only. Adjust your diaphragm for the clearest view. Sketch a cell in each of the following stages and describe: Interphase Prophase Metaphase Anaphase Telophase Cytokenesis Choose 3 rows of root tip to observe. Have someone help you record how many cells are in each phase: Interphase__________ telophase_________ prophase_________ metaphase_________ anaphase________ Determine the percentage of cells found in each stage. Interphase__________ telophase_________ prophase_________ metaphase_________ anaphase________ Answer: 1. Cells spend most of their time in what stage? 2. What seems to be the shortest stage? 3. What would happen if a cell skipped metaphase? 4. If you were a cell, what would your favorite phase be and why? Observe fish mitosis. What differences do you see in fish mitosis vs. onion mitosis?
