Name: ___________________________________________ Date: ____________________ Period: ____
Evidence of Evolution
Part A: FOSSILS (pg 382)
1. Observe the rock layer below noticing the various fossils present in each layer. How many layers of rock are
being observed? ____________
2.
3.
4.
5.
6.
Which fossil is probably older, A or C? ______
Which fossil is probably the most recent (newest), B or C? ______
Which fossil is probably the most complex, A, B, C, or D? ______
Which fossil is probably the most simple, A, B, C, or D? ______
How did you know which fossils are more simple or more complex?
Part B: Homologous Structures: (pg 384)
Carefully examine the drawings of the various bones below. Look for similarities among the various animals.
1.Describe the function of each animal’s bones
below:
a.
Human_________________________
b.
Horse__________________________
c.
Cat__________________________
d.
Bat__________________________
e. Whale___________________________
2. Are the bones arranged in a similar way in each animal? ________________________
3. Structures that are formed in similar ways during embryonic development, but have different mature forms
in different organisms are called,
_____________________________________________________________________
Part C: Vestigial Organs (pg 384)
1. The cave fish and minnow shown below are related, but the cave fish is blind. Explain why eyesight is not an
important adaptation to life in a cave. _________________________________
Name: ___________________________________________ Date: ____________________ Period: ____
2. Does the appearance of the cave fish and minnow suggest common
ancestry? ______ Why?
______________________________________
3. Do vestigial organs serve a useful purpose or function? ______
4. Name two human vesitigial organs. _______________________ and
________________
Part F: Biochemical Similarities
Compare the Cytochrome C amino acid sequence in humans to each of the
organisms listed below. You will find amino acid data on the “Amino Acids in
the Protein Cytochrome C” table. For each organism, circle each amino acid
that differs from the human sequence.
Note: Letters in boldface represent amino acids that are identical in all species.
indicates an amino acid that is missing in some
species. In places where one species has
and the other has a letter, count that as a difference.
1. Write down the number of differences between a human and a:
Tuna
Gray Whale
Rhesus Monkey
Chicken/Turkey
Baker’s Yeast
Silkworm Moth
2. Based on the amino acid sequence data you collected, which organism are humans most closely
related to? _____________________ Most distantly related to? _____________________
Explain your reasoning. _____________________________________________________________
1. If the amino acid sequences in the proteins of two organisms are similar, why will their DNA also be
similar? _______________________________________________________________________