Name _____________________________________
Period ______
Cell Cycle Internet Lab
Date ______________
I. Use the following URL to complete the first part of the lab:
http://biog-101-104.bio.cornell.edu/biog101_104/tutorials/cell_division.html
Look at the Whitefish (animal cell) and Onion Root Tip (plant cell) Mitosis slides. Pay
close attention to the descriptions of each of the phases of mitosis. Answer the six
questions that follow.
Question 1 ____________________________________
Question 2 ____________________________________
Question 3 ____________________________________
Question 4 ____________________________________
Question 5 ____________________________________
Question 6 ____________________________________
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 as you read each section. Not all answers are on the
screen. You will have to recall information discussed in class notes for some
questions.
1. Name the protein that DNA wraps around during chromosome formation.
____________________
2. During which stage of the cell cycle does DNA replication occur?
____________________
3. The nuclear membrane breaks down and centrioles begin moving to opposite
sides of the cell during this phase. ____________________
4. The centromere splits and replicated chromosomes separate during this phase.
____________________
5. The nucleolus is present and chromosomes are not visible during this phase of
the cell cycle. ____________________
6. Chromosomes line up in the middle of the cell during this phase.
____________________
7. The nuclear membrane reforms and spindle fibers break down during this
phase. ____________________
8. This is the longest phase of mitosis. ____________________
9. This is the shortest phase of mitosis. ____________________
4. Answer the following questions at the end of the Cell Cycle & Mitosis Tutorial
1) ______________________________________
3) ______________________________________
4) ______________________________________
5) ______________________________________
6) ______________________________________
7) ______________________________________
8) ______________________________________
10) ______________________________________
11) ______________________________________
5. 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