Results table Stage - Phase Number of cells Percentage of cells (%) (no. of cells/total no. of cells x 100) Interphase Mitosis - Prophase Mitosis - Metaphase Mitosis - Anaphase Mitosis - Telophase Cytokinesis TOTAL 100% Time in each stage (min) (no. of cells at each stage/total number of cells x 720)* 720 *The cell cycle for an onion root tip is about 12 hours (720 minutes)
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Step 1: Calculate the time spent in each stage of the cell cycle based on the total time of 720 minutes and the percentage of cells in each stage. Show more…
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TABLE 3: PERCENTAGE OF ONION ROOT TIP CELLS IN EACH STAGE OF THE CELL CYCLE Stage | Number of Cells Observed in Stage | Total Number of Cells | % of Cells in Stage Interphase Mitosis - Prophase Mitosis - Metaphase Mitosis - Anaphase Mitosis - Telophase Totals ACTIVITY 3 SUMMARY QUESTIONS 4. The percentage of cells in each stage can be used to estimate the length of time spent in each stage. The more time spent in a stage, the more cells you would expect to be in that stage at any given time.
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Onion Meristem Cells Onion meristem cells complete the cell cycle in 300 minutes. Use the data in the table to calculate the portion of the cycle spent in interphase. Show all your work. (1 mark) Phase Interphase Prophase Metaphase Anaphase Telophase Specimen 1 135 22 9 2 1
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Table 2: Mitosis Data Stage Number of Cells in Stage Total Number of Cells Calculated % of Time Spent in Stage Interphase 14 20 73% Prophase 3 20 13% Metaphase 0 20 0% Anaphase 1 20 0.044% Telophase 1 20 0.044% Cytokinesis 1 20 0.044% Post-Lab Questions 1. What is your conclusion after observing and counting the cells in the onion root tip? Did the results support your hypothesis? What, if anything, surprised you about the results? 2. What stage were most of the onion root tip cells in? What stage as least common among the cells you looked at? Explain how the number of cells in each phase relates to the time it takes a cell to complete each phase.
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