Name:______________________________________ Period:_____ Mitosis in Onion Cells Background Questions 1. Which phase of the cell cycle takes the longest time? 2. Which phase of the cell cycle takes the least amount of time? For each of the phases of the cell cycle and mitosis, write a brief description of what the cell would look like (focus on DNA/chromosomes). Interphase Prophase Metaphase Anaphase Telophase Stage/Phase Picture 1 Picture 2 Picture 3 Interphase 120 86 63 Prophase 12 5 6 Metaphase 3 1 0 Anaphase 2 0 1 Telophase 2 0 0 Total Cells in Picture Total # of cells per % of time in each phase phase Post-Lab Questions 1. What percentage of the cells that you observed were undergoing M phase (mitosis)? 2. Based on the number of cells observed in each phase of the cell cycle, which do you think takes the longest amount of time to complete? The lease amount of time to complete? Explain your reason. 3. What is the role of the cell cycle in the distribution of genetic information to new cells? 4. Refer to your circle graph: What changes occur in the nucleus of the cell during the longest phase of the cell cycle?