What did we learn from our
onion root tip investigation?
Starting Activity:
 Get your lab folder.
 Look at the reflection you made for HW.
 Identify 3 areas for improvement and target one as
your goal for this lab!
Introduction Peer Edit
 Switch your introductions with a partner:
 Did they identify knowledge of the cell cycle and
mitosis? Circle key vocab they used. If you think they
are missing terms write them on their page.
 Did they show knowledge of what an onion root tip is
and why the two areas (cortex and meristem) might
differ?
 Did they link the information about mitosis and onion
root tips to the purpose of the lab (I will ask to share
excellent examples here!)
Data Analysis
 From yesterday:
 Where did you see more cells? The cortex or the
meristem? Why is this information important? Where
might you discuss this information in your lab?
 Why did one group count 40 cells in the cortex and
another group counted 156? Is this a mistake? If not,
what might it suggest about the root tips? Would you
change anything about the experiment? Where might
you discuss this in your lab?
Today:
 Find a partner who was not in your lab group.
 Use the Excel spreadsheet to sum each column for
the cortex and meristem.
 Using the directions on your lab sheet, make a pie
chart for each.
 Organize the pie charts in a document and write a
trend that analyzes what the two pie charts show.
On your own:
 Construct a table to show your individual data and the
class totals. What trend does your table analyze?
 You will also need pie charts for your individual data.
What trend do your individual pie charts show? Is it
the same trend as the class data?
 Use your data and numbers to explain the conclusion
you are to draw about the cortex and meristem.
 What theme applies to this lab?
Lab Report Due:
 Tuesday March 11
 Tonight: Make your individual pie charts and use your
data to write part 1 & 2 (response to hypothesis and
error) of your conclusion!