Ch 23: Understanding Basics of Evolution

About This Chapter

Enhance your understanding of terms and processes relating to evolution using this short chapter. These lessons are great study aids you can use if you're studying for a science class discussion or exam or need to review material before taking professional certification exams.

Understanding Basics of Evolution - Chapter Summary

What is meant by the term 'evolutionary change'? What is genetic variation? How would you explain speciation? These are just a few of the topics you will explore when you refer to the lessons contained in this chapter.

You will also review facts about natural selection, evolutionary evidence and species extinction. After you complete your review of this chapter, you should be able to:

  • Discuss evolutionary change
  • Detail support for the theory of evolution
  • Explain what cladograms and phylogenetic trees are used for
  • Define and provide examples of natural selection and adaptation
  • Describe genetic variation
  • Provide examples of speciation
  • Identify causes of species extinction

This chapter makes it simple to review this material with video lessons that you can access from any device, at all times. View the lessons as often as needed and use short contact forms to reach out to instructors with any lesson-specific questions. Determine what you have learned by taking self-assessment quizzes as you complete one lesson and go to the next.

7 Lessons in Chapter 23: Understanding Basics of Evolution
Evolutionary Change: Definition and Forms

1. Evolutionary Change: Definition and Forms

You've probably heard of Charles Darwin and evolution. We know that evolution is change over time, but here we will look at how these changes may have occurred during Earth's history.

Evidence for Evolution: Paleontology, Biogeography, Embryology, Comparative Anatomy & Molecular Biology

2. Evidence for Evolution: Paleontology, Biogeography, Embryology, Comparative Anatomy & Molecular Biology

There is much support for the theory of evolution. This evidence comes from a variety of scientific fields and provides information that helps us trace changes in species over time. In this lesson, we'll look at this evidence and explore how it supports the theory of evolution.

Cladograms and Phylogenetic Trees: Evolution Classifications

3. Cladograms and Phylogenetic Trees: Evolution Classifications

Family trees help show how people are related to each other. Similarly, scientists use cladograms and phylogenetic trees to study the relationships between organisms.

Natural Selection & Adaptation: Definition, Theory & Examples

4. 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.

What Is Genetic Variation? - Sources, Definition & Types

5. 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.

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.

The Causes of Species Extinction

7. The Causes of Species Extinction

What do dinosaurs, passenger pigeons, and a species of Australian rat all have in common? They have all gone extinct. This lesson will examine the causes of species extinction from mass extinctions in the past to human-caused extinctions today.

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