viewCh10+meiosis notes in comp lab w/comp guided animated activity on cell cycle and mitosis
Mitosis (activity) - City University of New York
Transcript of Mitosis (activity) - City University of New York
Biology OEROpen Education Resources for General Biology 1 and Molecular & Cell Biologyhttps://openlab.citytech.cuny.edu/bio1-oer
Mitosis (activity)
Contents
1 Identifying mitotic phases2 Activity: Estimating the Time Spent in the Phases of Mitosis
2.1 Number of Cells in each phase2.2 Estimate of time spent in each phase of the cell cycle
3 Test yourself at home
Identifying mitotic phases
Identifying phases of mitosis in onion root tip. Click on the image to view larger image. Theoriginal figure without red boxes
Activity: Estimating the Time Spent in the Phases of Mitosis
Cells in your body reproduce at different rates. Skin cells reproduce frequently (about once per
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Biology OEROpen Education Resources for General Biology 1 and Molecular & Cell Biologyhttps://openlab.citytech.cuny.edu/bio1-oer
day); liver cells reproduce rarely (about once per year). Some specialized cells like nerve andmuscle cells almost never reproduce and are in a special stage called G0. The whole process ofmitosis, prophase to telophase, takes approximately 90 min. In plants, an area of rapid growth isthe tips of roots. This exercise uses onion root tips to illustrate the amount of time spent in eachphase of mitosis.
1. Work as a team to look at onion root tips under the microscope. This area of the root isundergoing rapid cell reproduction.
If time is short, use the slides belowslide 1slide 2slide 3slide 4slide 5slide 6slide 7
2. Identify the phases of the cell cycle for 20 randomly chosen cells. Record thisinformation in the table.
3. Trade results with 3 other people4. In an onion root tip, the entire cell cycle takes about 12 hours or 720 minutes5. Calculate the percentage of time spent in each phase by counting the total number of
cells in each phase (total in interphase, in prophase, etc.) and dividing each by the totalnumber of cells you counted.
6. Multiply the percentage of time in each phase by the total time of the cell cycle (720minutes) and this gives you an estimate of the time spent in each phase.
Number of Cells in each phase
Interphase Prophase Metaphase Anaphase Telophase Total
You (25)
Partner 1 (25)
Partner 2 (25)
Partner 3 (25)
Totals
Estimate of time spent in each phase of the cell cycle
Interphase Prophase Metaphase Anaphase Telophase Total
% of cellsineach phase
100%
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Biology OEROpen Education Resources for General Biology 1 and Molecular & Cell Biologyhttps://openlab.citytech.cuny.edu/bio1-oer
Timeestimate 720minutes
Test yourself at home
Use the following resource https://bio.rutgers.edu/~gb101/lab2_mitosis/section1_frames.html totest yourself and practice without a microscope.
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