BIOLOGY 101 Cell Division Gizmos
Student Exploration: Cell Division
Vocabulary: cell division, centriole, centromere, chromatid, chromatin, chromosome,
cytokinesis, DNA, interphase, mitosis
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Cells reproduce by splitting in half, a ...
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. Cells reproduce by splitting in half, a process called cell division. What do cells need to do
between divisions to make sure that they don’t just get smaller and smaller?
In between cell division the cells go through the interphase stage. This includes the G1
phase, the S phase and the G2 phase. In the G1 phase the cell is growing and starting to
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get ready to replicate DNA. In the S phase the DNA is replicated and in the G2 phase the
cell prepares to divide. Cells spend most of their life in this stage.
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2. The genetic information of a cell is carried in its DNA (short for deoxyribonucleic acid). What
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do cells need to do between divisions to make sure that a full set of DNA gets passed on to
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each daughter cell?
The cells have to synthesize (replicate) their DNA which is done in the S phase of
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interphase.
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Gizmo Warm-up
On the SIMULATION pane of the Cell Division Gizmo, check that
the Cycle Length is set to 12 hours. Click Play ( ), observe until
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the maximum number of cells is shown, and then click Pause ( ).
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1. Look at the cells. Do they all look the same? NO
2. Cells that are in the process of dividing are said to be in mitosis
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or cytokinesis. Cells that are not dividing are in interphase.
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Check the Magnify box and move the cursor over the cells.
A. Of the 100 cells shown, how many are in the process of dividing? 22
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B. Select the BAR CHART tab, and turn on Show numerical values. How many cells
are in the interphase stage of their life cycle? 78
This study source was downloaded by 100000828331062 from CourseHero.com on 08-15-2021 08:12:42 GMT -05:00
2018
C. Based on these two observations, would you say that a cell spends most of its life
cycle in interphase or in mitosis/cytokinesis? Most of the cell’s life is spent in
interphase
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This study source was downloaded by 100000828331062 from CourseHero.com on 08-15-2021 08:12:42 GMT -05:00
2018
https://www.coursehero.com/file/61819851/Cell-Division-Gizmodocx/
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