Guided Reading Essay

1430 WordsFeb 5, 20136 Pages
AP Biology Reading Guide Fred and Theresa Holtzclaw Chapter 23: The Evolution of Populations Name _______________________ Period ___________ Chapter 23: The Evolution of Populations This chapter begins with the idea that we focused on as we closed the last chapter: Individuals do not evolve! Populations evolve. The Overview looks at the work of Peter and Rosemary Grant with Galápagos finches to illustrate this point, and the rest of the chapter examines the change in populations over time. As in the last chapter, first read each concept to get the big picture and then go back to work on the details presented by our questions. Don’t lose sight of the conceptual understanding by getting lost in the details! Overview 1. What is microevolution? 2. What are the three main mechanisms that can cause changes in allele frequency? 3. Which is the only mechanism that is adaptive, or improves the match between organisms and their environment? Concept 23.1 Mutation and sexual reproduction produce the genetic variation that makes evolution possible 4. Because Darwin did not know about the work of Gregor Mendel, he could not explain how organisms pass heritable traits to their offspring. In looking at genetic variation, what are discrete characters, and what are quantitative characters? 5. Using the techniques of molecular biology, what are the two ways of measuring genetic variation in a population? 6. Geographic variation may be shown in a graded manner along a geographic axis known as a cline. What external factors might produce a cline? Why does the existence of a cline suggest natural selection? Copyright © 2010 Pearson Education, Inc. -1- AP Biology Reading Guide Fred and Theresa Holtzclaw Chapter 23: The Evolution of Populations 7. What is the ultimate source of new alleles? 8. Mutations are any change in the

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