Name: _______________________________________________
Period: ___
Yeast Lab
Introduction:
Yeast is a single-celled fungus that reproduces asexually. The purpose of this lab is to explore what
factors affect their rate of reproduction in a test tube. You will do this by mixing two solutions of yeast
in a test tube and measuring how much each mixture expands over the course of the lab.
You and your partner will decide how to set up the lab, with one “control” tube and one “test” tube.
Make sure that the tubes are only different in one way.
After you have run your experiment you will gather the results of two other groups and graph all three
together.
Materials:




Yeast
2x test tubes
Stop watch
Sugar



Ruler
Graph paper
Scale
Hypothesis:
If we change _______________________________________________________________
Then the amount of yeast will _________________________________________________
Because __________________________________________________________________
__________________________________________________________________________
Procedure:
1. ____________________________________________________________________
2. ____________________________________________________________________
3. ____________________________________________________________________
4. ____________________________________________________________________
5. ____________________________________________________________________
6. ____________________________________________________________________
7. ____________________________________________________________________
Data:
Table 1: Your Group’s Data
1 min
2 min
3min
4 min
5 min
6 min
7 min
5 min
6 min
7 min
5 min
6 min
7 min
Tube A
Tube B
We changed:
Table 2: First Group’s Data
1 min
2 min
3min
4 min
Tube A
Tube B
Group 1 changed:
Table 3: Second Group’s Data
1 min
Tube A
Tube B
Group 2 changed:
2 min
3min
4 min
Graph:
Key
Our data:
Group 1’s data:
Height of yeast (cm)
Group 2’s data:
Time (minutes)
Analysis:
1) What is one thing that seemed to make the yeast reproduce the fastest?
2) Why do you think that would affect the rate of reproduction for yeast?
3) Why do you think yeast use asexual reproduction?