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?
Cell must go through G1 in order to grow.
2. The genetic information of a cell is carried in its DNA (short for deoxyribonucleic acid). What
do cells need to do between divisions to make sure that a full set of DNA gets passed on to
each daughter cell?
They must duplicate DNA.
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
the maximum number of cells is shown, and then click Pause ( ).
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
or cytokinesis. Cells that are not dividing are in interphase.
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? About 5-10
B. Select the BAR CHART tab, and turn on Show numerical values. How many cells
are in the interphase stage of their life cycle? 85
C. Based on these two observations, would you say that a cell spends most of its life
cycle in interphase or in mitosis/cytokinesis? Interphase
This study source was downloaded by 100000835361505 from CourseHero.com on 02-02-2022 13:38:23 GMT -06:00
, Get the Gizmo ready:
Activity A: Click Reset ( ).
Phases of the cell Select the DESCRIPTION tab.
cycle Click on the right arrow once so that Interphase is
shown.
Question: What are the stages of the cell cycle?
1. Observe: Click Play and hold the cursor over the cell. Observe the cell as it divides several
times. (This happens quickly!) What do you notice happening during this process?
During the cells division the green part of the cell almost duplicates but in a yellowish color
only until it has completed the process.
2. Summarize: On the DESCRIPTION pane, read about each phase in the cell cycle. In the
spaces below, sketch the cell in each phase and summarize what occurs in your own words.
Phase Sketch Summary
Interphase The maturing of the cell.
Nucleus disappears as chromatin condenses to form a
Prophase chromosome.
Each chromosomes are attached to a spindle fiber. the
Metaphase spindle fibers change size and lengths.
Centromeres split and chromatids are pulled to the other
Anaphase side of the cell.
Telophase A nucleus membrane forms around the chromosomes.
Two identical nuclei are formed. The cytoplasm divides
Cytokinesis forming two daughter cells.
(Activity A continued on next page)
This study source was downloaded by 100000835361505 from CourseHero.com on 02-02-2022 13:38:23 GMT -06:00
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