Name:
Date:
Period:
3.Sub2 Homologous Structure
Directions: Navigate through webquest and answer each question in complete sentences unless it
is a fill in the blank. http://evolution.berkeley.edu/evolibrary/article/0_0_0/similarity_ms_01
Question
Answer
1. What is a reason
organisms can look
alike?
2. Define in your own
words a Homology.
Create a written and
visual example. (hint:
you might want to finish
this question at the end)
3. Define in your own
words an Analogy.
Create a written and
visual example. (hint:
you might want to finish
the question at the end)
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4. Play the Tale of the
Limb game by clicking
the item that is
different. What were
the similarities between
the limbs? In other
words, what were the
outsiders missing?
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5. Label and
color the bones
in common on
each organism.
6. How are
these tetrapod
limbs similar?
7. What 4 organisms
have these similar
structures? (you have to
click on the limbs at the
bottom)
8. Whales, lizards,
humans, and birds all
have the same basic
limb structure.
***PREDICTION***Wh
y do you think these
very different animals
have these similar
structures
1. _________________________________
2__________________________________
3. _________________________________
4.__________________________________
Classwork
Name:
Date:
3.Sub2 Homologous Structure
Period:
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9. Was your prediction
correct? What is the
reason all 4 organisms
have similar limb
structures?
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Use the information from this page to help you come up with your own definition of homology on number 2
10. How are the
beaver’s teeth and the
elephant’s tusk
different?
11. How are the
beaver’s front teeth the
elephant’s tusk similar
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12. Finish the sentence:
Homologies are inherited from
13. How do we know
the limbs of an octopus
and the limbs of a
tetrapod like a dog are
not related
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Use the information from this page to help you come up with your own definition of homology on number 3
14. Why are the long
teeth of the
Thylacosmilus and the
Smilodon not
homologous
structures?
15. Fill in the
blank
The Thylacosmilus is a ________________________________ mammal.
The Smilodon is a ______________________________mammal.
1. 1.
16. *** Not in the text.
Use your observation
skills***
What 3 similarities do
you see between sharks
and dolphins? List them
below.
2.
3.
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17. What are 4
differences between
dolphins and sharks
Sharks:
Dolfins
1. ____________________________________________ 1._________________________________________
2. ____________________________________________ 2._________________________________________
3. ____________________________________________ 3._________________________________________
4. ____________________________________________ 4._________________________________________
1.
What was similar and
important about the
environment the sharks
and dolphins lived in
that allowed them to
have similar features
without having a
common ancestor?
Classwork
Name:
Date:
3.Sub2 Homologous Structure
Period:
Classwork