Biology, Eighth Edition (Raven)

Chapter 20: Genes Within Populations

Learning Outcomes

Chapter 20
  • Recognize that natural selection is the correct mechanism for explain evolution.
  • Understand the importance of and identify sources of genetic variation.
  • Know how to solve various problems associated with Hardy-Weinberg equilibrium.
  • List the five factors, and state an example of each, that affect Hardy-Weinberg equilibrium and understand how each can produce evolutionary changes in a population experiencing any one of the five.
  • Compare and contrast the founder effect and the bottleneck effect.
  • Understand the term fitness and all of the considerations that are involved with the concept of fitness.
  • Distinguish between positive and negative frequency-dependent selection.
  • Comprehend what is meant by “the heterozygote advantage,” and explain the example given in the text.
  • Describe and be able to graph the examples of the three kinds of selection.
  • Appreciate the limitations of selection
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