Mitosis in Onion Cells
Date________________
Name__________________
Class___________________
Use the website
http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html to answer
the following.
1. Why do they use onion root tip cells to look for cells in the phases of mitosis?
2. As you sort the cells keep track of how many are in each phase. Use the chart below.
Interphase
Prophase
Metaphase
Anaphase
Telophase
Total
Number
of Cells
36
Percent of
cells out
of 36
100%
3. Based on the results of this lab, which phase do the cells spend most of their time in?
4. Which phases do the cells tend to go fastest through?
Use the website
http://www.sumanasinc.com/webcontent/animations/content/mitosis.html to answer the
following questions.
5. What is cytokinesis?
6. Go to the animation of mitosis, select the step-through option. Use this program to
identify which phase of mitosis is being described.
Description
DNA is replicated
Pairs of chromatids line up in the equator
of the cell.
Nuclear Envelope (membrane) disappears
Separating chromosomes reach the poles of
the cell
Chromatin coils and condenses
Cytokinesis starts to occur
Microtubules attach to the centromeres
Phase
Go the following website and take the quiz about the phases of mitois.
http://school.discoveryeducation.com/quizzes6/muskopf/mitosis1.html
Submit your answers and write your score below.
Score = number correct/10