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Assignment C-1: Cell Division Gizmo
 Read the Explorelearning Enrollment Handout in the Introduction materials folder
to learn how you can access Gizmos
...
They are part of your
mark
...

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Follow the instructions carefully and step by step work through the gizmo and
answer the required questions
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Prior Knowledge Questions (Do these BEFORE using the Gizmo
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Cells reproduce by splitting in half, a process called cell division
...
The genetic information of a cell is carried in its DNA (short for deoxyribonucleic
acid)
...
Click Play
(
), observe until the maximum number of cells is shown,
and then click Pause (
)
...
Look at the cells
...
Cells that are in the process of dividing are said to be in
mitosis or cytokinesis
...

Check the Magnify box and move the cursor over the
cells
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A
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Select the BAR CHART tab, and turn on Show numerical values
...
Based on these two observations, would you say that a cell spends most
of its life cycle in interphase or in mitosis/cytokinesis?
Activity A:
Get the Gizmo ready:
 Click Reset (
)
...

 Click on the right arrow once so that
Interphase is shown
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Phases of the
cell cycle

< >

Question: What are the stages of the cell cycle?

1
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Observe the cell as it
divides several times
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Summarize: On the DESCRIPTION pane, read about each phase in the cell cycle
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Phase

< >

Th

Interphase

Sketch

sh

Prophase

Metaphase

< >

Summary

< Interphase is the growth
stage that is divided into 3
substages which each focus on
the growth of a different part >
< The prophase starts with the
nucleus membrane
disappearing, the chromosomes
being formed, the spindle fibers
being formed and finally with
the nucleolus disappearing
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< >

< >

< Anaphase is the splitting of
the chromosomes along the
centromeres
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This results with 2 identical
cells being formed
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Anaphase

attachment of the centromeres
of the chromosomes to the
spindle fibers and then the
chromosomes are aligned on
the cell’s equator >

Telophase

Cytokinesis

< >

< >

3
...
What are the four phases of mitosis<

Prophase, Metaphase,

Anaphase, Telephase >

Th

B
...
What is the relationship between chromatin and chromosomes <

chromosomes are the condensed form of
chromatin
...
In which phase are chromatids pulled apart?

< Anaphase >

This study source was downloaded by 100000828326221 from CourseHero
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What is the role of the centrioles?

< >

F
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A cell has a single line of chromosomes
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During which three phases are individual chromosomes no longer visible?

< Telophase, Cytokinesis, and interphase >
4
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each daughter cell would only get half of a complete
set of DNA >

5
...
Each chromosome consists of
a pair of identical chromatids attached together by a structure called a
centromere
...
< Each daughter cell will have 46

daughter chromosomes
...
>
Activity B:

Get the Gizmo ready:

Duration of
phases

 Click Reset
...


Th

Question: What is the relative duration of each phase of the cell cycle?

sh

1
...
Click Pause
when the maximum number of cells has been reached
...

Record the number of cells in each phase of the cell cycle in the table below
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Repeat this
process until you have recorded four sets of results, and then find the average
number of cells in each phase
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Trial

Interphas
e

Prophase

Metaphas
e

Anaphase

Telophase

Cytokines
is

1

92

4

0

0

2

2

2

82

13

2

1

1

1

3

86

7

3

1

1

4

87

Avg
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2
...
Calculate: You can use your data to estimate the duration of each phase of the
cell cycle
...
8 hours (48
minutes)
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Show
your work
...

 Select the GRAPH tab
...


Question: How quickly do cells multiply?

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coursehero
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Collect data: Click Play to start a new
simulation
...

View the total number of cells on the
GRAPH tab
...
)
Draw a sketch of this graph here
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2
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A
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About how long did it take to grow the last 20 cells? < >
C
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< >

3
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What do you think will happen if cell division is not controlled? < >

sh

Th

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