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Name _____________________________________ Date ______________ Period ______ Cell Division: Mitosis and Meiosis Introduction I. Use the following URL to complete the first part of the lab: http://www.biologycorner.com/quests/mitosis.html Read the three Introduction paragraphs. Answer the three Introduction questions. 1. ______________________________________________________________________ ______________________________________________________________________ 2. ______________________________________________________________________ 3. ______________________________________________________________________ ______________________________________________________________________ 4. Click on the Whitefish Embryo. Identify the four stages of mitosis seen in the images from left to right. _________________________________ _________________________________ _________________________________ _________________________________ 5. At the top of the page, Click on the Root Tip Page. Identify the five stages of the cell cycle seen in the images from left to right. _________________________________ _________________________________ _________________________________ _________________________________ _________________________________ II. Use the following URL to complete the second part of the lab: http://www.biology.arizona.edu 1. Click on the Cell Biology link. 2. Click on The Cell Cycle and Mitosis link and read each of the three sections listed on the left of the screen. Click “Next” as you come to the end of each section. a.) DNA Basics b.) The Cell Cycle c.) Mitosis 3. Answer the following questions at the end of the Cell Cycle & Mitosis Tutorial 1) ______________________________________ 2) ______________________________________ 3) ______________________________________ 4) ______________________________________ 5) ______________________________________ 6) ______________________________________ 7) ______________________________________ 8) ______________________________________ 9) ______________________________________ 10) ______________________________________ 11) ______________________________________ 4. Next, complete the Online Onion Root Tips activity. Read the contents of the first two screens before beginning the activity. You are to place each drawing into one of the five phases. Keep tally marks in the table below of the number of cells you find in each stage. Then list what percentage of cells there are in each stage. Interphase Prophase Metaphase Anaphase Telophase Total 36 # of cells 100% % of cells % of cells calculation # of cells counted in each phase 36 X 100 III. Observe the prepared slides of mitosis in onion root cells and whitefish blastula. Locate the cells on the slide that are undergoing mitosis. In the observations section, draw and label what you observe (on high power)on the slide in the order that corresponds to the phases of mitosis. Observations: Onion Root Tip Whitefish Blastula Prophase Metaphase Anaphase Telophase III. Answer the following questions on a separate sheet of paper. You may wish to type your responses. Please staple your answers to the back of this lab. 1. How did you develop from a single-celled zygote to an organism with trillions of cells? How many mitotic cell divisions would it take for one zygote to grow into an organism with 100 trillion cells? 2. How is cell division important to a single-celled organism? 3. What must happen to ensure successful cell division? 4. How does the genetic information in one of your body cells compare to that found in other body cells? 5. What are some advantages of asexual reproduction in plants? 6. Why is it important for DNA to be replicated prior to cell division? 7. How do chromosomes move inside a cell during cell division? 8. How is the cell cycle controlled? What would happen if the control were defective? 9. If a cell contains a set of duplicated chromosomes, does it contain any more genetic information than the cell before the chromosomes were duplicated? 10. What is the significance of the fact that chromosomes condense before they are moved? 11. How are the chromosome copies, called sister chromatids, separated from each other? 12. What would happen if the sister chromatids failed to separate?