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Mitosis in Onion Root Tips Online
1. Go to www.biology.arizona.edu/cell_bio/cell_bio.html or look up
Online Onion Root Tips on google and click on the first link.
2. Click on Activities: Online Onion Root Tips
3. Read the directions.
4. Click Next
5. Read about the phases of mitosis and examine the pictures.
6. Click Next
7. Read the Directions. (You do not have to make your own table. One is
included below.)
8. Click Next
9. Do the activity. Fill in the number of cells in each phase on the table
below. Keep track as you go through the slides. (There are 36 slides to
identify.)
10. Calculate the percent of cells in each phase by dividing the number of
cells found in that phase by the total number examined (36).
11. Multiply the percent times 24 hours and fill that number in the “Time for
Each Phase” row.
12. Multiply the “Time in Each Phase” by 60 to figure out the number of
minutes in each phase.
13.
Divide the Minutes for Each Phase by 1440 minutes to figure out the %
of cell cycle in each phase.
Interphase
Number of
Cells
Percent of
Cells
Hours for
Each Phase
Minutes for
Each Phase
% of cell
cycle in
each phase
Prophase
Metaphase
Anaphase
Telophase
Total
36
100%
24 hours
1440
minutes
There is more on the back. Turn Over 
The Cell Cycle & Mitosis Tutorial Quiz
 Go to: www.biology.arizona.edu/cell_bio/tutorials/cell_cycle/main.html
 Read through the first few pages: Introduction, DNA Basics, The Cell Cycle, (skip
the part about regulation of the cell cycle), Mitosis
 Hit the Problem 1 key on the screen to test yourself with the online quiz. Write the
whole answer, not just the letter representing the answer after each question below.
1.
The stage of the cell cycle where each chromosome is composed of two chromatids in preparation for mitosis.
2. The class of enzymes that are involved in triggering events in the cell cycle are called:
3.
Which sequence of the cell cycle is common to Eukaryotes?
4.
The stage of the cell cycle where the cell is preparing to begin DNA replication is called:
5.
The proteins which complex with DNA producing the "beads on a string" or nucleosomes are called:
6.
Which of the following features of cell division are very different for animal and plant cells?
7.
Prior to cell division, each chromosome replicates or duplicates its genetic material. The products are connected by a
centromere and are called:
8.
The first stage of mitosis when chromosomes start becoming visible in the microscope is called:
9.
The sputum (fluid coughed up from the lungs) of many smokers contains cells with mutations (errors) in the genes for
p53. The smoking induced mutations appear to be an early signal showing that cancer of the lungs will follow. What is
the likely relationship between early p53 mutation and the development of lung cancer?
10. Which of the following statements is NOT true of mitosis?