Download The Cell Cycle

The Cell Cycle
Webquest
All living things go through orderly changes from birth to death.
Often times these changes are given tag names like infancy, adolescence,
and adulthood. Cells, being living things, also under go changes throughout
their lifecycle. However, cells end their lifecycle by dividing and producing
to two new “daughter cells” identical to the parent cell. Close examination of
the cell can reveal where a cell is with respect to its stage of life.
Procedure:
Log on to the following website:
http://www.sci.sdsu.edu/multimedia/mitosis/
Click on the interactive Mitosis Tutorial where it says “What is Mitosis”
1. What is Mitosis?
2. What are the five primary phases of mitosis? Scroll over each phase to
learn more.
3. Besides Mitosis, what other stages are there in the lifecycle of a cell?
4. Describe each of the following stages of the cell cycle:
Scroll over each phase to learn more.
a. G1b. Sc. G2-
5. Click on Contents. Click on the Interactive Mitosis Animation. Adjust
the speed to slow. View the video and familiarize yourself with the
movements of the chromosomes during each phase of mitosis.
Log on to the website: http://iknow.net/cell_div_education.html
Scroll down to the blue shaded box “The cell cycle” and click the image to
watch the “Cell Cycle” movie.
Now scroll down the page to where it says “The Phases of Mitosis”
Click on the link within the rectangle prophase that says watch an animal cell
undergo mitosis or click here:
http://iknow.net/player_window.html?url=media/prophase_video_auto.swf&
width=360&height=285
Now watch the video on plant cell mitosis:
http://iknow.net/player_window.html?url=media/plant_mitosis_auto.swf&wid
th=360&height=285
6. Explain how mitosis in plant and animal cells is different (hint: watch the
last phase Telophase carefully)
Log on to the website www.cellsalive.com
Under the Contents menu click on the link for Cell Biology, from the table of
contents scroll down to the link for Cell Cycle and click.
Read the contents under the animation on this page and examine the
animations as well to answer the following:
1. What is the term used to describe all activities that occur between
cell divisions- the apparent resting stage of the cell?
2. How long does this stage (#1 above) usually last in typical mammalian
cells?
3. Which of these stages is the most important with respect to the
events of the M-phase, and why?
4. What do the two structures at the 7 o’clock position of the animation
represent (the ones that make the unzipping noise)?
5. What is happening here and why are there two pairs of these
structures?
Click on the link at the left side of this page Mitosis. Or just click here
http://www.cellsalive.com/mitosis.htm
Watch this animation. You can click on any stage (right) to just show that
frame for the animation.
On this page or from any of the previous pages, list,
describe, and make a sketch of each phase of Mitosis.
Mitosis is the collective term used to describe the events leading up to cell
division. These events sort, and segregate the genetic information (DNA)
and organelles to ensure that the new daughter cells will have the proper
machinery to carry out their life functions. Diagram and describe these
phases:
PROPHASE:
description
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PROMETAPHASE:
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METAPHASE:
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ANAPHASE:
TELOPHASE:
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CYTOKINESIS:
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What follows cytokinesis?
Here is one final link with a video that I would like you to view:
http://www.allthingsscience.com/video/490/The-Stages-of-Mitosis
Click on the link for Meiosis, wait for the animation to load and view the
animation. This may take awhile. Be patient!
1. What are the only types of cells where Meiosis takes place?
2. How do Meiotic cells differ from Mitotic cells?
3. During Metaphase I of Meiosis, how does the alignment of
chromosomes differ from the alignment in Metaphase of Mitosis?
4. Describe Crossing Over. What significance does this have for the
forthcoming daughter cells?
5. Summarize the differences between Mitosis and Meiosis in terms of
the number of cells produced, the amount of genetic material, types of
cells that undergo each process of division.