Ch 11: Holt McDougal Biology Chapter 11: The Evolution of Populations

About This Chapter

The Evolution of Populations chapter of this Holt McDougal Biology Companion Course helps students learn the essential lessons associated with how populations evolve. 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 Holt McDougal Evolution of Populations chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover topics on the evolution of populations 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:

  • Genetic variation types
  • Kinds of natural selection
  • The definition for sexual selection
  • Hardy-Weinberg equilibrium
  • Differences between temporal and mechanical isolation
  • Descriptions of convergent and divergent evolution
  • Adaptive radiation and punctuated equilibrium
  • What coevolution is
  • Basics of extinction

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15 Lessons in Chapter 11: Holt McDougal Biology Chapter 11: The Evolution of Populations
Test your knowledge with a 30-question chapter practice test
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.

Natural Selection: Definition, Types & Examples

2. 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.

Gene Flow: Definition & Examples

3. Gene Flow: Definition & Examples

Chances are you've probably witnessed gene flow today! This lesson will define gene flow and give examples. It will also explain why gene flow creates genetic diversity.

Genetic Drift: Definition, Examples & Types

4. 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.

Sexual Selection: Definition & Forms

5. 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.

Hardy-Weinberg Equilibrium I: Overview

6. 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

7. 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

8. 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.

Mechanical Isolation: Definition & Example

9. Mechanical Isolation: Definition & Example

What prevents species that are closely related from mating with each other? Sometimes it's just a matter of having the right equipment - mechanical isolation is one evolutionary mechanism that prevents different species from interbreeding.

Temporal Isolation: Example & Definition

10. Temporal Isolation: Example & Definition

What prevents species that are closely related from mating with each other? Temporal isolation is an evolutionary mechanism that keeps individuals of different species from interbreeding, even if they live in the same environment.

Convergent & Divergent Evolution: Definition & Examples

11. Convergent & Divergent Evolution: Definition & Examples

Ever wonder why birds and bees both have wings, even if they aren't related? This lesson will examine that question. In addition, it will define and explain convergent and divergent evolution and will give examples of each.

Coevolution: Examples & Definition

12. Coevolution: Examples & Definition

Can you imagine having a tongue three times the length of your body? There actually exists a moth with such a tongue, and it evolved due to the features of a flower that it feeds on. Learn about this and other examples of organisms that have evolved together.

What Is Extinction? - Defining Background and Mass Extinction

13. What Is Extinction? - Defining Background and Mass Extinction

In this lesson you'll discover what the term 'extinction' means as well as learn the two different types of extinction: mass extinction and background extinction. You will also discover how humans contribute to extinction events.

Punctuated Equilibrium: Definition, Theory & Examples

14. Punctuated Equilibrium: Definition, Theory & Examples

In this lesson, we'll take a look at the theory of punctuated equilibrium developed by the notable paleontologists Niles Eldredge and Stephen Jay Gould. We'll define punctuated equilibrium, explain its basic tenets and see some simple examples.

Adaptive Radiation: Definition & Example

15. Adaptive Radiation: Definition & Example

Adaptive radiation is when members of a single group or lineage evolutionarily diverge into a variety of different forms. These forms are dictated by selection pressures and the use of habitats or resources.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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