Biologist ___________________________
Date ______________
Understanding Evolution: Homology and Analogy
http://afederoff.pottsgrove.wikispaces.net/Evolution
1. In the image, which pair represents an analogy and which is a homology?
2. Define homology:
3. Define analogy:
4. What is a tetrapod?
5. What are the six bones found in all tetrapod legs?
6. Identify these limbs (to what animal do they below)?
7. What did the common ancestor of all modern tetrapod’s look like?
8. How are a bird and a crocodile homologous?
9. Similar structures that evolved independently are called __________________.
10. What is the difference between a marsupial and a placental?
11. What is Smilodon?
12. What is Thylacosmilus?
13. Describe how 2 unrelated flowers could evolve to have a similar appearance?
14. Are similarities between sharks and dolphins homologous or analogous?
15. What is morphology?
16. What 3 criteria are used to determine whether something is a homology or analogy?
17. 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? Explain why you would conclude this.
18. How are a Venus fly trap and a pitcher plant homologous?
19. How are barnacles and limpets alike? How can these similarities be explained?
20. What is one example of a homologous behavior?