Biology (Holt)

3. Build the cell model your group
   designed. CAUTION: Sharp or
   pointed objects can cause injury. Handle
   scissors carefully. Promptly notify your
   teacher of any injuries. Use your model to
   demonstrate the phases of mitosis. Draw
   and label each phase you model.

4.Use your model to explore one of the ques-
tions written for step 4 of Before You
Begin. Describe the steps you took to
explore the question.

PARTB: Test Hypotheses

Answer each of the following questions by
writing a hypothesis. Use your model to test
each hypothesis, and describe your results.

5.Cytokinesis follows mitosis. How will the
size of each new cell that is formed follow-
ing cytokinesis compare with that of the
original cell?

6.Sometimes two chromatids fail to separate
during mitosis. How might this failure
affect the chromosome number of the two
new cells?

7.A mutation is a permanent change in a
gene or chromosome. What effect might a
mutation in a parent cell have on future
generations of cells that result from the
parent cell?

PART C: Cleanup and Disposal

8. Dispose of paper and yarn scraps in
   the designated waste container.


9. Clean up your work area and all lab
   equipment. Return lab equipment to
   its proper place. Wash your hands thor-
   oughly before you leave the lab and after
   you finish all work.

Analyze and Conclude

1. Analyzing ResultsHow do the nuclei
   you made by modeling mitosis compare
   with the nucleus of the model cell you
   started with? Explain your result.


2. Evaluating Methods How could you
   modify your model to better illustrate the
   process of mitosis?


3. Recognizing PatternsHow does the
   genetic makeup of the cells that result from
   mitosis compare with the genetic makeup
   of the original cell?


4. Inferring Conclusions How is mitosis
   important?


5. Further Inquiry Write a new question
   about mitosis or the cell cycle that could be
   explored with your model.

http://www.scilinks.org

Topic:Cell Cycle

Keyword:HX4033

Do You Know?

Do research in the library or media center

to answer these questions:

1.How often do different cells of the

human body undergo mitosis?

2.What are some common chemicals

that disrupt the cell cycle?

Use the following Internet resources to

explore your own questions about mitosis

or the cell cycle.

CHAPTER 6Chromosomes and Cell Reproduction 137