Activity 13

1. Activity 13 The Processes and Outcomes of Evolution

3. What process do you think produce the biodiversity of life on Earth?

4. Read the introduction. • Microevolution is evolution on a small scale, and it results in changes in the proportion of genes in a population. • Speciation is the formation of species as a result of barriers to gene flow that split the gene pool, followed by an accumulation of differences between the gene pools.

5. Macroevolution is the larger changes and patterns in evolution. • Extinction occurs when the last member of a species dies. At this point the species is said to be extinct.

6. Challenge • How do evolutionary processes lead to changes in biodiversity?

7. Anticipation Guide: The Processes and Outcomes of Evolution • Fill in the Before column of the anticipation guide before beginning the reading. • Fill in the After column once you have completed the reading.

8. Return to Student Sheet 3.1, “Ideas about Evolution” • Add information from this activity or a previous activity to support whether any of the statements are correct or incorrect.

9. Analysis 2 • Many Hawaiian honeycreeper birds evolved a musk-like odor that is distasteful to predators. Explain how this adaptation might have evolved through natural selection.

10. Revisit the Challenge • How do evolutionary processes lead to changes in biodiversity?

11. Key Vocabulary • adaptation • adaptive character • adaptive radiation • co-opted feature • extinct • extinction • fit • fitness • gene flow • genetic drift • geographic isolation • macroevolution • mass extinction • microevolution • natural selection • reproductive isolation • speciation