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

Genetic variation is the diversification of alleles and genes within a specific population to create a healthy gene pool. Learn about the types of genetic variation, continuous and discrete traits and the sources of genetic variation.

Natural Selection: Definition, Types & Examples

2. Natural Selection: Definition, Types & Examples

Natural selection is a process in the evolution and adaptation of organisms to increase primary characteristics. Learn about the process of natural selection, the different types of natural selection, and the concept of polymorphism.

Gene Flow: Definition & Examples

3. Gene Flow: Definition & Examples

Gene flow is the movement of genes from one population to another population and, more specifically, the movement of different alleles or forms of genes. Learn more about gene flow through its definition, examples and influence on genetic diversity.

Genetic Drift: Definition, Examples & Types

4. Genetic Drift: Definition, Examples & Types

Genetic drift happens when chance events cause changes in the genetic variations of a population. Examine the definition and learn the types of genetic drift. See examples of population bottlenecking and the founder effect.

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

The Hardy-Weinberg equilibrium equation is regularly used to describe genotypic frequency in a population. Learn more on Hardy-Weinberg Equilibrium I, the five criteria and it's usage in the genetics of a population.

Hardy-Weinberg Equilibrium II: The Equation

7. Hardy-Weinberg Equilibrium II: The Equation

The Hardy-Weinberg equilibrium equation helps in analyzing and understanding the gene pool of a population. Learn about this equation, including the variables it represents and where to find these variables, understand alleles and genotypes, and explore the significance of allelic and genotypic frequencies.

Hardy-Weinberg Equilibrium III: Evolutionary Agents

8. Hardy-Weinberg Equilibrium III: Evolutionary Agents

The Hardy-Weinberg equilibrium equation has been developed to be used to test the evolutionary status of a population. Learn more about evolutionary agents, non-random mating, natural selection, genetic drift, population bottleneck and the founder effect.

Mechanical Isolation: Definition & Example

9. Mechanical Isolation: Definition & Example

Mechanical isolation is a type of reproductive barrier that prevents mating from happening. Explore mechanical isolation in animals and plants, and learn some examples.

Temporal Isolation: Example & Definition

10. Temporal Isolation: Example & Definition

Reproductive barriers prevent different species of similar animals from reproducing, while temporal isolation stops interbreeding between closely related species. Know the definition of reproductive barriers, its two types, and examples of how temporal isolation promotes speciation.

Convergent & Divergent Evolution: Definition & Examples

11. Convergent & Divergent Evolution: Definition & Examples

All living organisms, including humans, have undergone periods of evolution that can be described as divergent or convergent. Learn the definition of evolution and examples of organisms that have diverged and become unique species, and others that have taken on, or converged, the traits of two or more organisms.

Coevolution: Examples & Definition

12. Coevolution: Examples & Definition

Coevolution is when species trigger evolutionary changes in each other. Dive deeper into the definition of coevolution, the two types of coevolution, examples, the mutualistic coevolution of moths and orchids, the predator and prey coevolution of snakes and newts, and the parasite and host coevolution of brood parasites and birds.

What Is Extinction? - Defining Background and Mass Extinction

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

Learn about extinction, which occurs when an organism ceases to exist anywhere on Earth. Learn the definition and background of extinction, explore mass extinction, and discover humanity's role in extinction rates.

Punctuated Equilibrium: Definition, Theory & Examples

14. Punctuated Equilibrium: Definition, Theory & Examples

Punctuated equilibrium is a scientific hypothesis of the reasons why curious patterns found in the fossil record signify the presence of a new species previously unknown to have appeared on Earth. Explore a definition and explanation of the theory of punctuated equilibrium, and find examples of curious patterns in fossil records.

Adaptive Radiation: Definition & Example

15. Adaptive Radiation: Definition & Example

Adaptive radiation refers to the evolutionary adaptation of a single lineage into many different forms, usually based on habitat or available resources. Discover the definition of adaptive radiation, examples of how it works, the influence of selective pressures, and how adaptive radiation functions in nature.

Chapter Practice Exam
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