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Download Mitosis in Real Cells Lab 2012
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Name __________________________________________________ Class _____________ Date ______ Mitosis in Real Cells Onion root cells and Whitefish cells You will be looking at some prepared slides with onion root cells and whitefish cells. You will need to find the step in the Cell Cycle and Mitosis, identify it, and then draw what you see. You must also answer the following questions. This sheet is posted both on my blog and in my common folder. You may find the website above helpful in identifying the cells. http://www.biologycorner.com/projects/mitosis.html 1. Interphase is the stage in the cell cycle during which the cell is not dividing. The cell grows to about twice the size it was when it was first produced. It produces various organelles and engages in normal life activities. Changes that occur during interphase prepare a cell for division. Draw this step in the process as seen on each slide below. Onion root cells Whitefish cells 2. In prophase, the chromatin in the nucleus condense into chromosomes. The membrane around the nucleus breaks down. Draw this step in the process as seen on each slide below. Onion root cells Whitefish cells Name __________________________________________________ Class _____________ Date ______ 3. In metaphase, the chromosomes line up in the middle of the cell. Draw this step in the process as seen on each slide below. Onion root cells Whitefish cells 4. In anaphase, each chromosome breaks up into two chromatids. They are pulled to opposite sides of the cell. Draw this step in the process as seen on each slide below. Onion root cells Whitefish cells 5. In telophase, a new nuclear membrane forms around each group, and the chromosomes unwind into chromatin. After telophase, cytokinesis begins. Draw this step in the process as seen on each slide below. Onion root cells Whitefish cells Name __________________________________________________ Class _____________ Date ______ 6. Cytokinesis is the division of the parent cell’s cytoplasm. Cytokinesis starts during the last step of mitosis and eventually forms two complete cells. In plant cells, a cell plate forms during cytokinesis. The cell plate separates the cell into two new cells. Draw this step in the process as seen on each slide below. Onion root cells Whitefish cells Questions 7. How many cells did you find on a slide? ______________________ Which slide did you count? What problems did you have with counting the cells? Explain below. Find answers to the following questions. You must record the source for each question. Google is not a source. Use complete website. 8. How many cells does and adult whitefish contain in its body? 9. How many cells does an onion contain (bulb only)? 10. How many cells does an adult human contain in their body? Name __________________________________________________ Class _____________ Date ______ Tasks: If you want to check you drawings or if you had trouble viewing some slides, view slide images of both the whitefish blastula and the onion root to see cells in various stages of mitosis at the following website. http://www.biologycorner.com/projects/mitosis.html You can review the stages of mitosis in your book or at: http://www.cellsalive.com/mitosis.htm There is a link in the upper right hand corner of the first page of the biology corner website with the onion cell and whitefish cell. 11. Why is the whitefish used to study mitosis? Explain. 12. What are the four stages of mitosis? 13. How long does it take for mitosis to complete? Explain. 14. Why will most of the cells you view be in interphase? Explain. Name __________________________________________________ Class _____________ Date ______ Microscopic view of whitefish cell Microscopic view of onion root cell
