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Ch 27: Genetic Variation & Evolution

About This Chapter

Learn about or review the relationship between evolution, natural selection and genetic variation. Use these short lessons and quizzes to refresh your understanding of genetic mutations, speciation and how the environment and genes formulate behavior. These resources can help you prepare for an exam or catch up on class topics you might have missed.

Genetic Variation & Evolution - Chapter Summary

This chapter defines genetic variation and explains how it works with natural selection to drive evolution. You'll be introduced to the relationship between genes and the environment and see how they influence traits and behavior. You'll also learn about adaptations and how they work together with natural selection.

As you progress through the chapter, you'll learn more about phenotypes and how genetic variability helps a population adapt. You'll also learn more about speciation, and how many species have been identified on Earth. Once you've completed this chapter, you should understand:

  • What drives natural selection
  • How both genes and environment play a role in behavior
  • Ways adaptation can provide information about the evolution of a species
  • How evolution and natural selection work together
  • What a phenotype is
  • How random genetic mutations can actually help a population
  • Formation of new species on Earth

Our easy-to-follow videos are designed by professional instructors to make learning fun. After viewing the text and video lessons, take the accompanying quizzes to test your knowledge. You can review the lessons and take the quizzes as many times as you need until you feel you've mastered this material. If you'd like to review the material when you're offline, simply print out the text lesson or video transcript.

6 Lessons in Chapter 27: Genetic Variation & Evolution
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.

Gene-Environment Interaction

2. Gene-Environment Interaction

The following lesson explores how genes and a person's environment influence behavior and outward expression of traits. A short quiz will follow the lesson to check your understanding of this timely topic.

Natural Selection & Adaptation: Definition, Theory & Examples

3. Natural Selection & Adaptation: Definition, Theory & Examples

How does natural selection help shape the amazing types of animals we witness around us? In this lesson, we'll explore adaptations and what they can tell us about a species' past evolution.

Why Natural Selection Acts on Phenotype, Not Genotype

4. Why Natural Selection Acts on Phenotype, Not Genotype

Evolution works through the mechanism of natural selection. This mechanism influences the genetic make-up of populations, acting on the population's physical traits. In this lesson, we'll explore examples of why this is.

Genetic Variability and Random Mutation

5. Genetic Variability and Random Mutation

Evolution is driven by variation among populations. The amount of variability determines how well a population can adapt to environmental changes, while random mutations can provide new variations that help a population adapt to unexpected changes.

Speciation: Definition, Examples & Role in Evolution

6. Speciation: Definition, Examples & Role in Evolution

Can you believe that over two million species have been identified on Earth? Have you ever wondered how so many species formed on Earth? Learn more about how new species form and test your knowledge with a quiz.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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