Identifying mitotic phases - City University of New York
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Mitosis (activity) CC-BY-NC-SA | Jeremy Seto | New York City College of Technology | 1 Contents 1 Identifying mitotic phases 2 Activity: Estimating the Time Spent in the Phases of Mitosis 2.1 Number of Cells in each phase 2.2 Estimate of time spent in each phase of the cell cycle 3 Test yourself at home Identifying mitotic phases Train yourself with Mitosis Sequence Exercise and Mitosis Phase Identification Flash Cards
Transcript of Identifying mitotic phases - City University of New York
Mitosis (activity)
CC-BY-NC-SA | Jeremy Seto | New York City College of Technology | 1
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
Train yourself with Mitosis Sequence Exercise and Mitosis Phase Identification Flash Cards
Mitosis (activity)
CC-BY-NC-SA | Jeremy Seto | New York City College of Technology | 2
Activity: Estimating the Time Spent in the Phases ofMitosisCells in your body reproduce at different rates. Skin cells reproduce frequently (about onceper day); liver cells reproduce rarely (about once per year). Some specialized cells likenerve and muscle cells almost never reproduce and are in a special stage called G0. Thewhole process of mitosis, prophase to telophase, takes approximately 90 min. In plants, anarea of rapid growth is the tips of roots. This exercise uses onion root tips to illustrate theamount of time spent in each phase of mitosis.
Work as a team to look at onion root tips under the microscope. This area of the root is1.undergoing rapid cell reproduction.
If time is short, use the slides belowslide 1slide 2slide 3slide 4slide 5slide 6slide 7
Identify the phases of the cell cycle for 25 randomly chosen cells. Record this2.information in the table.Trade results with 3 other people3.In an onion root tip, the entire cell cycle takes about 12 hours or 720 minutes4.Calculate the percentage of time spent in each phase by counting the total number of5.cells in each phase (total in interphase, in prophase, etc.) and dividing each by thetotal number of cells you counted.Multiply the percentage of time in each phase by the total time of the cell cycle (7206.minutes) and this gives you an estimate of the time spent in each phase.
Number of Cells in each phase
Interphase Prophase Metaphase Anaphase Telophase TotalYou (25)
Mitosis (activity)
CC-BY-NC-SA | Jeremy Seto | New York City College of Technology | 3
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 cells ineach phase 100%
Timeestimate
720minutes
Test yourself at homeUse the followingresource https://bio.rutgers.edu/~gb101/lab2_mitosis/section1_frames.html to test yourselfand practice without a microscope.
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