Mrs. Sutton
Biology CP – 4 White
29 May, 2012
Teddy Graham Natural Selection Lab Report
Introduction
Purpose
Hypothesis
Materials:
1. Teddy Grahams, four types, 82 total.
2. Calculator
3. Paper Towels
4. Bear Den (Box, Container, Etc.)
Procedure:
1. Collect all materials and get in groups of 3.
2. Randomly select 10 bears from the bear den without looking and place them on the
paper towel.
3. Record the number of happy, sad, tan and brown bears in the data chart.
4. Go hunting!! Eat 4 happy bears. If there are not three happy bears, then eat the
difference in sad bears.
5. Once you have consumed the bears, allow them to reproduce. Select 6 new bears from
the den randomly.
6. Record the number of happy, sad, tan and brown bears in the data chart.
7. Repeat the procedure for hunting and reproducing 3 more times
8. Calculate the percentages of happy, sad, tan, and brown bears for each generation.
9. Graph the percentages on one sheet of graph paper to show the changes in the traits.
10. Clean up and eat the remaining bears. Do not put the bears back in the box!
Data and Analysis:
Number of bears in 5 generations
Generation 1
# of happy
bears
% of happy
bears
# of sad
bears
% of sad
bears
# of tan
bears
% of tan
bears
# of brown
bears
% of brown
bears
Total # of
bears
*See attached graph
Generation 2
Generation 3
Generation 4
Generation 5
Critique of Hypothesis:
Critical Connections:
Works Cited:
Biggs, Alton, and Whitney C. Hagins. Biology: the Dynamics of Life. New York:
McGraw Hill Companies, Inc, 2004.