11 Jun BIO S3852519 – Name a set of homologous structures
Question
4.5.3 Test (TS): Teacher Scored Unit Test
Biology Sem 2 (S3852519)
Points possible: 50 Test
Max MacCormack
this to your teacher when you are done.
1. a) Name a set of homologous structures. (4 points) b) Two species have homologous structures. What do these homologous structures show about the
evolutionary relationship between the two species? (3 points)
2. a) What is gene flow? (3 points) b) Why does gene flow prevent speciation? (2 points)
3. Two species are very similar. Name three types of evidence you could find to provide evidence that they
had a common ancestor. (5 points)
4. a) In a species of rat, height is a polygenic trait. What does it mean for this trait to be polygenic? (3
points) b) The curve on the left shows the height of a rat population in 2007. The curve on the right shows the
population in 2010. What type of selective pressure was taking place in this population? (2 points) c) Explain how you know what type of selective pressure this is. (2 points)
5. A grassland ecosystem in North America is very flat. It has almost no variation in geography. There are
no natural barriers, and organisms can easily enter or leave the ecosystem. Name two reasons this
ecosystem would have a low rate of speciation. (6 points) 6. a) How are protists different from bacteria? (2 points) b) Are eukarya more closely related to bacteria or archaea? Explain. (4 points)
7. The pine tree shown below is a common gymnosperm. Name three adaptations this tree has that allow it
to live on land. (6 points)
8. A cladogram is shown below. a) What species is the outgroup of this cladogram? b) Name all of the traits that the frog has, based on this cladogram. c) Which trait evolved first, jaws or lungs? Explain how you know.
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