University:
Eastern Kentucky University
Course:
BIO 101 | Essentials of Biology
Academic year:

2022
Views:

44

Pages:

6
Author:

blakestar2o1o

Mitosis How do living things grow and repair themselves? Why? Living things must grow and develop. At times they suffer injuries or damage, or cells simply wear out. New cells must be formed for the organism to survive. What process must occur to make a new, properly functioning cell? Model 1 – Mitosis as Part of the Cell Cycle 1. Refer to Model 1. List the four phases in the mitosis process. Prophase, Metaphase, Anaphase, and Telophase 2. Where is mitosis in the cell cycle? Before G1 and Cytokinesis and after interphase. 3. What three phases of the cell cycle are considered interphase? G1, Synthesis, and G2 4. Refer to the cell cycle shown. a. How many cells are present at the beginning of mitosis? One Mitosis 1 b. How many cells are present at the end of mitosis? Two 5. Refer to the chromosomes in the cells in Model 1. a. Draw a single chromosome as it appears in Model 1. b. Draw a replicated chromosome as it appears in Model 1. c. How many chromatids are in each replicated chromosome? Two Chromatids 6. How many replicated chromosomes are in the original cell shown in Model 1 during prophase? Hint:When counting chromosomes, count <1= for a pair of sister chromatids. 4 replicated chromosomes 7. How many single chromosomes are in each of the new cells in telophase? 4 single chromosomes 8. As a group, write a grammatically correct sentence that explains what a chromosome is and why it is important. A chromosome is tightly wrapped dna and contains genetic information. 9. Refer to the cells in telophase in Model 1. a. Use a complete sentence to describe what the new cells in telophase might contain if replica-tion of chromosomes did not occur before cytokinesis. They would only have half the required chromosomes b. If the situation in part a occurred, would the new cells be viable? Explain. No, as they do not have the full set of DNA 10. The S phase stands for synthesis, which means to make or build something more complex out of simpler parts. Scientists know that during the S phase DNA is being made in the nucleus of the cell. Why do you think the cell needs to make more DNA at this time in the cell cycle? So there is enough to make the new cell Mitosis 3 11. Refer to Model 1. The chromosomes that are shaped like