Name: _________________________________________________________  Period: _______

 

Understanding Evolution: Homology and Analogy

Go to the website http://evolution.berkeley.edu/evolibrary/article/similarity_hs_01

1.      Define homology:

 

2.      Define analogy:

 

 

3.      In the image, which pair represent an analogy and which is a homology?

 

4.     

 

 

 

 

 

4. Click on next at the bottom of the page. Which limb does not like the others?

a.       1st picture:

 

b.      2nd picture:

 

c.       3rd picture:

 

5.      Click on next at the bottom of the page. What is a tetrapod?

 

6.      What are the six bones found in all tetrapod legs?

 

 

 

 

 

7.      Identify these limbs, to what animal do they belong?

 

8.      Click on next at the bottom of the page. How old is the common ancestor of the tetrapods?

 

9.      Structures inherited from a common ancestor are called __________________________.

 

10.  Click on next at the bottom of the page. The incisor teeth of the beaver and the elephant are homologous structures. Why do they look so different?

 

11.  On the right hand side of the page under “Details”, click on “not just anatomy”. How are a bird and a crocodile homologous?

 

12.  Up at the top of the page, X out of that page to return to the previous page. Click on next at the bottom of the page. Why are the limbs of an octopus not homologous with the limb of a lizard?

 

 

 

13.  Similar structures that evolved independently are called __________________________.

 

14.  Click on next at the bottom of the page. What is a marsupial mammal and name the sabertooth animal that was a marsupial.

 

15.  What is a placental mammal and name the sabertooth animal that was a placental.

 

16.  Complete the following cladogram:

 

17. Click on next at the bottom of the page. Click play. Why do the two flowers end up looking alike?

 

     18.

 Click on next at the bottom of the page. Submit your answer. Are the similarities between sharks and dolphins homologous or analogous?

 

19. Click on the next at the bottom of the page. List the three criteria used to figure out if a trait is a homology or an analogy.

a.

 

b.

 

c.

 

 

20. Click on next at the bottom of the page. Fill in the blanks of the primate cladogram.

 

21. Click on next at the bottom of the page. Submit your answer. Considering all of the evidence, are the "wings" (actually flaps of skin stretched between the legs) of sugar gliders and flying squirrels homologous or analogous structures?

 

22. On the right hand side of the page under “Details”, click on “more examples of homology”. How are the Venus fly trap and pitcher plant homologous?

 

23. Click on next at the bottom of the page twice. How are bowerbirds an example of homology?

 

24.  Click on next at the bottom of the page. What does the Pax-6 gene do?

 

25. Click on next at the bottom of the page twice. The bones of the ears of mammals are homologous to what in lizards?

 

26. Up at the top of the page, X out of that page to return to the previous page. On the right hand side of the page under “Details”, click on “more examples of analogy”. 

Inside, barnacles are have the body layout of a ____________________ and limpets have

 

the body layout of a __________________________.

 

27. Click on next at the bottom of the page four times. What is the major difference between anteaters and echidnas that shows that their adaptions to eating ants are analogous?