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CHAPTER 16
MiniLab
Observe the Functions
of an Opposable Thumb
How do opposable thumbs aid in everyday tasks? Explore the advantages of
performing everyday activities with and without the aid of opposable thumbs.
Procedure
1. Read and complete the lab safety form.
2. Create a data table to record your observations.
3. Have a partner tape your thumbs to the sides of
your hands with masking tape.
4. Using your taped hands, perform the following
tasks: pick up a pen or pencil and write your
name on a piece of paper, tie your shoelaces,
and open a closed door. Have your partner use a
stopwatch to time each task.
5. Have your partner remove the tape from your
hands, then repeat the activities in step 4 with
the use of your thumbs. Have your partner time
each task.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Data and Observations
Analysis
1. Compare and contrast the time and effort required to complete each task with and
without the aid of your thumbs.
2. Infer the advantages that ancestral primates with opposable thumbs would have had
over competitors without opposable thumbs.
Unit 4
CHAPTER 16 Primate Evolution
75