NAME______

As a class, we will watch several animations, video clips and still pictures to try and understand the process of mitosis.

Mitosis is the cell division process that produces two daughter cells that are genetically identical to the mother cell.

First let’s watch these videos.

http://www.youtube.com/watch?v=JHRBJgq50dk

http://www.youtube.com/watch?v=s1ylUTbXyWU&feature=related

http://www.youtube.com/watch?v=VlN7K1-9QB0&feature=related

Write a description of mitosis based on the above three videos.

Now let’s look at these pages with pictures of the various stages of mitosis.

http://www.hybridmedicalanimation.com/anim_mitosis.html

http://www.stolaf.edu/people/giannini/flashanimat/celldivision/crome3.swf

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__mitosis_and_cytokinesis.html

http://www.angelfire.com/de/nestsite/mitosis.html

http://www.sumanasinc.com/webcontent/animations/content/mitosis.html

http://biology.nebrwesleyan.edu/benham/mitosis/

For each of the following stages, write a description of what is happening to the cell and the nucleus.

Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis

Now we will go to the website below and collect some data. You will be shown some cells in different stages of mitosis. You will decide which phase each cell is in and record in the table. Then you will use your result to predict how much time a dividing cell spends in each phase.

http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html

Interphase / Prophase / Metaphase / Anaphase / Telophase / TOTAL
# of cells / 36 cells
% of cells / 100%
Degrees in a circle / 360o

When you finish calculating your percentages, prepare the pie chart below. A circle has 360 degrees so, if you find that 50% of the cells are in interphase, then you will multiply 0.50 x 360 and get 180 degrees. Use a protractor to create sections of your circle that represent the correct number of degrees for that phase. Continue with the other phases and be sure to label each section.

Questions:

1.  Mitosis produces two nuclei from one nucleus. The number or chromosomes in each new nucleus is the same as that in the nucleus from which they were formed. What does this suggest must happen to the number of chromosomes in the nucleus before it divides?

2.  In which stage of the cell cycle do the chromosomes get duplicated?

3.  How are plant and animal cell divisions similar?

4.  How are plant and animal division different?

5.  Suppose you suspect that the frequency of mitosis in onion roots varies with the time of day. How would you go about getting data to confirm or refute your suspicion?

Now go to the following website:

http://www.uoguelph.ca/zoology/devobio/210labs/MitosisQuiz/mitosisqframe.html

Take the quiz. Notice that when you click on an answer, you will be told whether you are correct or not (at the top of the page). There are a few of the questions that you have not learned about yet, but you might still be able to figure them out.