Download Cell Division - Onion and Whitefish Investigation

Name _____________________________________
Date ______________
Period ______
Cell Division: Mitosis and Meiosis Introduction
I. Use the following URL to complete the first part of the lab:
http://www.biologycorner.com/quests/mitosis.html
Read the three Introduction paragraphs. Answer the three Introduction questions.
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4. Click on the Whitefish Embryo. Identify the four stages of mitosis seen in the images
from left to right.
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5. At the top of the page, Click on the Root Tip Page. Identify the five stages of the cell
cycle seen in the images from left to right.
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II. Use the following URL to complete the second part of the lab:
http://www.biology.arizona.edu
1. Click on the Cell Biology link.
2. Click on The Cell Cycle and Mitosis link and read each of the three sections listed on
the left of the screen. Click “Next” as you come to the end of each section.
a.) DNA Basics
b.) The Cell Cycle
c.) Mitosis
3. Answer the following questions at the end of the Cell Cycle & Mitosis Tutorial
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4. Next, complete the Online Onion Root Tips activity. Read the contents of the first
two screens before beginning the activity. You are to place each drawing into one of
the five phases. Keep tally marks in the table below of the number of cells you find
in each stage. Then list what percentage of cells there are in each stage.
Interphase
Prophase
Metaphase Anaphase Telophase
Total
36
# of
cells
100%
% of
cells
% of cells calculation
# of cells counted in each phase
36
X
100
III. Observe the prepared slides of mitosis in onion root cells and whitefish blastula.
Locate the cells on the slide that are undergoing mitosis. In the observations section,
draw and label what you observe (on high power)on the slide in the order that
corresponds to the phases of mitosis.
Observations:
Onion Root Tip
Whitefish Blastula
Prophase
Metaphase
Anaphase
Telophase
III. Answer the following questions on a separate sheet of paper. You may wish to
type your responses. Please staple your answers to the back of this lab.
1. How did you develop from a single-celled zygote to an organism with trillions of
cells? How many mitotic cell divisions would it take for one zygote to grow into an
organism with 100 trillion cells?
2. How is cell division important to a single-celled organism?
3. What must happen to ensure successful cell division?
4. How does the genetic information in one of your body cells compare to that found
in other body cells?
5. What are some advantages of asexual reproduction in plants?
6. Why is it important for DNA to be replicated prior to cell division?
7. How do chromosomes move inside a cell during cell division?
8. How is the cell cycle controlled? What would happen if the control were defective?
9. If a cell contains a set of duplicated chromosomes, does it contain any more genetic
information than the cell before the chromosomes were duplicated?
10. What is the significance of the fact that chromosomes condense before they are
moved?
11. How are the chromosome copies, called sister chromatids, separated from each
other?
12. What would happen if the sister chromatids failed to separate?