Download After completing the onion root tip microscope lab, in which you

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Online Onion Root Tip Lab
After completing the onion root tip microscope lab, in which you viewed the actual
cells to see the different phases of mitosis for yourself, you will use the Project
Biology website to do an online onion root tip lab. In this lab you will compare the
amount of time spent in each phase of mitosis as well as interphase for an actively
dividing tissue.
The online lab will show you 36 cells from a section of onion root tip, allowing you
to more quickly categorize the phase of each cell and then the website will organize
them into columns for you.
Go to the following website:
http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html
Read the directions and then copy down the data chart in the space below.
Fill in the data chart with your results after you have completed the online lab.
Then calculate the percentage of cells in each phase.
1.
Which part of the cell cycle takes the longest?
2.
Why is this part of cell cycle the longest – even in actively dividing tissue? (What
activity is occurring during this period that would require more time?)