Cell Division Gizmo 2021 Part 2 PDF

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Student Exploration: Cell Division, Part 2 Vocabulary: cell division, centriole, centromere, chromatid, chromatin, chromosome, cytokinesis, DNA, interphase, mitosis

Activity B:

Get the Gizmo ready:  Click Reset.  Select the TABLE tab.

Duration of phases

Question: What is the relative duration of each phase of the cell cycle? 1. Collect data: Set the Cycle Length to 10 hours and click Play. Click Pause when the maximum number of cells has been reached. On the TABLE tab, click Record data. Record the number of cells in each phase of the cell cycle in the table below. Then click Play, wait for a while, and click Record data again. Repeat this process until you have recorded four sets of results, and then find the average number of cells in each phase. Trial

Interphase

Prophase

Metaphase

Anaphase

Telophase

Cytokinesis

1

81

10

4

2

2

1

2

80

10

3

3

1

3

3

78

9

4

2

3

4

4

79

11

3

2

3

2

Avg.

79.5

10

3.5

2.25

2.25

2.5

2. Analyze: Which phase of the cell cycle is longest? ___Interphase_________ Shortest? ___cytokinesis _________ Explain your answers: _On the graph it is visible that interphase has the highest average number of cells ___in it so that would mean that it would take longer than the rest of the phases for it to finish._______________________________________________________ _____________________________________________________________________________________

3. Calculate: You can use your data to estimate the duration of each phase of the cell cycle. For example, if 8% of the cells were in prophase and the cell cycle was 10 hours long, then prophase would last 8% of 10 hours, or 0.8 hours (48 minutes). Use percentages to estimate the duration of each phase of the cell cycle. Show your work. Interphase:

________477_minutes._________________________________________________

Prophase:

___________60 minutes_______________________________________________

Metaphase:

___________21 minutes_______________________________________________

Anaphase:

_______13 minutes___________________________________________________

Telophase:

_____________13 minutes_____________________________________________

Cytokinesis:

_____________15 minutes_____________________________________________

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Get the Gizmo ready: Extension: Cell populations

 Click Reset.  Select the GRAPH tab.  Set the Cycle Length to 5 hours.

Question: How quickly do cells multiply? 1. Collect data: Click Play to start a new simulation. Click Pause when the maximum number of cells is reached. View the total number of cells on the GRAPH tab. (Click the “–” button until the whole graph is visible.) Draw a sketch of this graph here.

What is the general shape of the graph? ____________It us an upwards trend.________________________ ____________________________________ ____________________________________

2. Analyze: Look closely at the graph. A. About how long did it take to grow the first 20 cells? ___________55 hours._______________ B. About how long did it take to grow the last 20 cells? ____________Around 5 hours.. ______________ C. Would you say the rate of cell growth is increasing or decreasing? Explain. ________________________It is decreasing because at the beginning the rate of cell growth was very fast but then it gradually slowed down over time. ___________________________________________ ___________________________________________________________________

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3. Extend your thinking: In living organisms, the cell cycle is closely regulated. What do you think will happen if cell division is not controlled? _________If not controlled the cells can be produced too quickly which can harm, the body by creating masses in the body or if the cells are produced too little the body wont have enough cells to complete its functions which would harm homeostasis. ________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________ _________________________________________________________________________

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