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BI 101 Week 6 Lab Report Questions (Mitosis and Meiosis) 1. Label the arrows below with the appropriate stage of the cell cycle: Type answer here A B C Type answer here F E D Type answer here Type answer here Type answer here Type answer here 2a. In what stage were most of the onion root tip cells in? Based on what you know about cell cycle division, does this make sense? Type answers here b. Were there any stages of the cell cycle that you did not observe? How can you explain this using evidence from the cell cycle? Type answers here 3. As a cell grows, what happens to its surface area:volume ratio? (Hint: Think of a balloon being blown up). How does this ratio change after a cell finishes dividing? Why is this important for the function of the cell? Type answers here 4a. What is the difference between mitosis vs. cytokinesis? Type answer here b. What would happen if mitosis were uncontrolled? Type answer here Record your results from “Experiment 1: Observation of Mitosis in a Plant Cell” in the tables below: Table 1: Mitosis Predictions Predictions: Supporting Evidence Table 2: Mitosis Data Number of Cells in Each Stage Total Number of Cells Calculated % of Time Spent in Each Stage Interphase: Interphase: Prophase: Prophase: Metaphase: Metaphase: Anaphase: Anaphase: Telophase: Telophase: Cytokinesis: Cytokinesis: For each of the phases listed above in “Table 2: Mitosis Data”, draw an example a cell in that phase in the space below (you may also insert/attach a photo of your drawings done on paper): Interphase: Prophase: Metaphase: Anaphase: Telophase: 5. Why is it important that each daughter cell produced during mitosis contain information identical to the parent cell? What would happen if it didn’t? Type answers here For “Experiment 2: Tracking Chromosomal DNA Movement through Mitosis”, including a drawing or photo of your mitosis bead diagram for each of the following phases: Prophase: Metaphase: Anaphase: Telophase: 6. Suppose a person developed a mutation in a somatic cell which diminishes the performance of the body’s natural cell cycle control proteins. This mutation resulted in cancer, but was effectively treated with a cocktail of cancer-fighting techniques. Is it possible for this person’s future children to inherit this cancer-causing mutation? Be specific when you explain why or why not. Type answer here For “Experiment 3: The Importance of Cell Cycle Control”, in the space below, please list the name of the five abnormalities your research uncovered and describe why each is considered abnormal: 1. Type answer here 2. Type answer here 3. Type answer here 4. Type answer here 5. Type answer here 7. Compare and contrast mitosis and meiosis. Type answer here 8a. In “Experiment 1: Following Chromosomal DNA Movement through Meiosis”, how many chromosomes were present when meiosis I started? Type answer here b. How many nuclei are present at the end of meiosis II? How many chromosomes are in each? Type answers here c. What is the ploidy (i.e. diploid, haploid, etc.) of the DNA at the end of meiosis I? What about at the end of meiosis II? Type answers here d. How are meiosis I and meiosis II different? List two reasons Type answers here 9a. Why did you use non-sister chromatids to demonstrate crossing over? Type answer here b. What combinations of alleles could result from a crossover between BD and bd chromosomes? Type answer here c. Why is it necessary to reduce the number of chromosomes in gametes, but not in other cells? Type answer here 10. Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: a. Sperm Cell: Type answer here b. Egg Cell: Type answer here c. Daughter Cell from Mitosis: Type answer here d. Daughter Cell from Meiosis II: Type answer here