~~Mitosis Virtual Lab~~ CLASS: 90
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1 SCIENCE 9 ~~Mitosis Virtual Lab~~ NAME: DATE: CLASS: 90 In this virtual lab, you will further explore mitosis. In this first part of the virtual lab, you will be exploring how long each cell spends in each phase of the cell cycle. In the second part of this virtual lab, you will compare animal and plant cells. Go to : and click on the Onion Root Tips link on the left hand side. Part A: Before you begin ~~Read the information provided on this first page of the website~~ 1. The cell cycle is a cycle, meaning that it is continuously happening. Why is it necessary that the cell cycle happen continuously in both animal and plant cells? 2. Which phase of the cell cycle do you expect that each cell spends the most time in? Which phase of the cell cycle do you expect that each cell spends the least time in? Explain your reasoning. 3. In both parts of this virtual lab, you will be looking at onion root tips. Why do you think that scientists may find onions to be a good specimen to use to study cells?
2 Part B: Determine the amount of time cells spend in each part of the cell cycle. ~~Click next. Refresh your memory on the various stages of the cell cycle~~ 4. For each phase of the cell cycle provided on this second page of the website, provide a brief description of how a cell in a given stage physically appears. Phase of the cell cycle Interphase Description of physical appearance Prophase Metaphase Anaphase Telophase/Cytokinesis ~~Click Next. Read the information on the activity you are about to complete and click Next again. ~~
3 5. In this part of the virtual lab, you will classify photos of cells taken from an onion root tip by their current phase within the cell cycle. a. As you identify classify each cell, keep a running tally of how you classified them in the chart provided below. You may need to zoom in within your internet browser to be able to see the photos of the onion well. Number of cells Percentage of total cells Interphase Prophase Metaphase Anaphase Telophase/ Cytokinesis TOTAL % b. Now that you have classified all of the cells provided, calculate the percentage of the total cells that were photographed in each phase. Enter this data in the table above. 6. After completing this part of the virtual lab, compare your results with the predictions you made when you began this lab. a. During which phase do cells spend most of their time? Why do you think this is? b. During which phase do cells spend the least of their time? Why do you think this is? 7. You have just finished observing 36 of the cells captured from one sample of one onion tip. a. Do you believe that these results would be the same for any sample of cells? Explain b. If you answered no to 6a., how much do you think the results would vary? Explain
4 Part C: Comparing Animal and Plant Cells ~~Go to the website Select Lab 2: Cell Reproduction.~~ 8. What is the difference between mitosis and cytokinesis? ~~Click Begin Assignment. Click on the photo to the right to enlarge.~~ 9. Reflecting back on the first part of this virtual lab, identify a few cells that are dividing actively engaged in mitosis, and a few cells that are in interphase. How can you tell that a cell is actively engaged in mitosis? ~~Click on Click to Begin under part 3. Click on the root tip photo, and use the scroll bar to move the slide up and down. Identify at least one cell at each stage of the cell cycle. ~~ 10. If you were to look at every single cell in this slide and classify them by their stage (you do NOT have to do this), do you believe that you would find identical results to part 1? Explain ~~Click on Part 4: Mitosis in an animal cell. Click Click here to begin to change the slide. Click on the photo of the slides on the right to magnify the slides.~~ 11. Study each of the cells, and identify at least one cell in each phase of the cell cycle. In the chart below, sketch at least one cell in each stage. Stage Interphase Prophase Metaphase Anaphase Telophase/ Cytokinesis Sketch
5 Part D: Conclusion Questions: 12. What were two differences that you noticed between animal and plant cells? 13. Which cell stage was the easiest to identify? Explain. 14. Which cell stage was the most difficult to identify? Explain : Illustrate and describe the basic process of mitosis and meiosis 210-6, 210-4: Compile and report data and predict values of variables by doing activities on cell populations
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