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 Campbell Biology: Online Textbook Help
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Ch 23: Campbell Biology Chapter 23: The Evolution of Populations

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About This Chapter

The Evolution of Populations chapter of this Campbell Biology Companion Course helps students learn the essential lessons associated with the evolution of populations. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Evolution of Populations textbook chapter.

How It Works:

  • Identify the lessons in the Campbell Biology Evolution of Populations chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the evolution of populations topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Sources of genetic variation
  • The Hardy-Weinberg equilibrium equation
  • How an evolutionary agent is defined
  • Kinds of genetic drift
  • Causes of microevolution
  • Different kinds of natural selection
  • Forms of sexual selection
  • Types of balancing selection

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9 Lessons in Chapter 23: Campbell Biology Chapter 23: The Evolution of Populations
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What Is Genetic Variation? - Sources, Definition & Types

1. What Is Genetic Variation? - Sources, Definition & Types

Natural selection is the process that drives evolution, but what drives natural selection? Genetic variation increases the genetic diversity in and among populations, allowing for new traits to become more or less prominent in the gene pool.
Hardy-Weinberg Equilibrium I: Overview

2. Hardy-Weinberg Equilibrium I: Overview

In this lesson, we'll examine population genetics in greater detail. We'll also explore notions of Hardy-Weinberg equilibrium for large, stable populations. Is the genetic makeup of our flying hamster population changing? The Hardy-Weinberg equilibrium can serve as a reference point as we try to answer population genetics questions.
Hardy-Weinberg Equilibrium II: The Equation

3. Hardy-Weinberg Equilibrium II: The Equation

The Hardy-Weinberg equilibrium equation is represented by a polynomial, so we'll have to do some calculations. Don't be intimidated; a few coin tosses can help us make sense of allelic frequencies in a given gene pool.
Hardy-Weinberg Equilibrium III: Evolutionary Agents

4. Hardy-Weinberg Equilibrium III: Evolutionary Agents

In this lesson, you'll learn how the Hardy-Weinberg equation relates to different evolutionary agents and population changes. Discover how the equation may be used to discover populations that are not in equilibrium.
Genetic Drift: Definition, Examples & Types

5. Genetic Drift: Definition, Examples & Types

Genetic drift reduces genetic variability of a population by decreasing the size of the population. The change in population size and variability often leads to new species and unique populations.
Causes of Microevolution: Natural Selection, Gene Flow & Genetic Drift

6. Causes of Microevolution: Natural Selection, Gene Flow & Genetic Drift

Environments are dynamic, which causes populations to be as well. In this lesson, you'll learn about microevolution, as well as the mechanisms behind it that cause changes in allele frequencies within populations.
Natural Selection: Definition, Types & Examples

7. Natural Selection: Definition, Types & Examples

We'll take a look at the types of natural selection that can occur. From flying hamsters to moths, you'll start to grasp the different paths organisms can take as they respond to their changing environments over time.
Sexual Selection: Definition & Forms

8. Sexual Selection: Definition & Forms

Why are you attracted to someone? One reason may be due to the forces of sexual selection. This lesson will explain sexual selection and will investigate types of sexual selection.
Balancing Selection: Heterozygote Advantage & Frequency-Dependent Selection

9. Balancing Selection: Heterozygote Advantage & Frequency-Dependent Selection

You may have heard of natural selection, but what about balancing selection? This lesson will cover two important mechanisms that help keep genes in a population, which is important to populations if they don't want to become extinct!
Chapter Practice Exam
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Practice Final Exam
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