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Name ________________________________________________ Date ______________ Modeling The Cell Cycle Lab Introduction: The growth of an organism is controlled at the cellular level. An organism’s cells are in a continuous cycle of growth and division. Each new daughter cell produced during this process has the same exact genetic information that the parent cell had. The growth and division of a cell is called the cell cycle. Background Information: 1. What are the three steps of the cell cycle? a. ___________________________ b. ___________________________ c. ___________________________ 2. How many chromosomes are in the body cells of humans? ______________ 3. When your body cells undergo mitosis, how many chromosomes do the new daughter cells have? _________________ 4. What are the steps (in order) of mitosis? a. __________________________ b. __________________________ c. __________________________ d. __________________________ 5. During telophase what structure do plant cells form that animal cells do not? _________________________________ Procedure: View cells in each stage of the cell cycle and make a sketch of each on a separate sheet of paper. Answer questions 1 – 3, Analyze and Conclude, on page 283. Finish questions in this packet. Analysis and Conclusion: The illustration below shows various stages of mitosis in a fast growing onion root tip. Color the diagram above using the following key: interphase – red prophase - purple metaphase - blue anaphase - orange telophase - green Calculate the percentage of cells in the diagram of the onion that are in each stage. Circle your answer. Interphase Anaphase Prophase Telophase Metaphase Remember: What part of a very young onion would most likely go through the cell cycle the most, root, stem, or leaf? Explain your choice using your knowledge of plant growth. Label the following diagram of mitosis of an animal cell. The letters indicate stages of the cell cycle. The numbers represent cellular structures. Which stage of the cell cycle is not represented in the diagram above? _________________ What stage are the daughter cells in at the end of the cell cycle?____________________ If a body cell from a horse with 64 chromosomes went through mitosis how many chromosomes would be in the daughter cells? ______________ How many daughter cells are produced from mitosis? _________