Name: ____________________
Directions: Using the picture below, identify as many cells as you can and label them with the appropriate stages of the cell cycle. The first one has been done for you.
Metaphase
1. Tally up how many cells are in each stage of the cell cycle:
Number of cells in Interphase: _______
Number of cells in Prophase: _______
Number of cells in Metaphase: _______
Number of cells in Anaphase: _______
Number of cells in Telophase: _______
Number of cells in Cytokinesis: _______
Total number of cells identified: ___________

2. Calculate the percentage of time each cell spends in each stage of the cell cycle. Use the formula below:
Number of cells in a phase
Total number of cells
X 100 = % of time
Percentage of time in Interphase: _______
Percentage of time in Prophase: _______
Percentage of time in Metaphase: ________
Percentage of time in Anaphase: _______
Percentage of time in Telophase: _______
Percentage of time in Cytokinesis: _______
3. Shade in the pie chart below using the percentages you calculated in the previous question. The pie chart equals a total of 100 percent of the cell’s life cycle. Label the pie segments with each stage of the cell cycle. Use colors to shade in the segments.
4. In which stage of the cell cycle do cells spend the majority of their life?
Explain why we would expect to find these results.

5. Explain a way to tell the difference between Interphase and Prophase which can be difficult to distinguish when looking at real cells?
6. Why would the root tip of an onion plant have so many cells undergoing cell division?
7. What evidence shows that mitosis is a continuous process, not a series of separate events?
8. Use this table to help answer the following questions:
Stage of Cell
Cycle
Interphase
Prophase
Metaphase
Anaphase
Telophase
Normal Chicken Stomach
Cells
(Hours)
9
1
.17
.05
.2
Cancerous Chicken Stomach Cells
(Hours)
6.3
.75
.17
.05
.17
9. In normal chicken cells, which phase requires the longest time for completion? _____________
10. In normal chicken cells, which phase requires the shortest time for completion? _____________
11. How do your answers from 9 & 10 compare to the percentages you calculated in your pie chart?
12. What is the total time needed for a normal chicken stomach cell to complete the cell cycle?
(Total up the time in hours for each phase.)
13. What is the total time needed for a cancerous chicken stomach cell to complete the cell cycle?
14. How do cancer cells differ from normal cells in time spent for each phase?