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Ch 14: Basics of Evolution

About This Chapter

Look over these lessons to examine the basics of evolution, including the natural selection process and other related theories. Gain continuing education credits, raise your grades, or prepare for a test by finding out more about evolution.

Basics of Evolution - Chapter Summary

Evolution is the theory that all living organisms change over time, and there are various factors and processes that cause these changes. In these lessons, you will go over details about the theories associated with evolution, how evolutionary processes work, and other related concepts. Our instructors have prepared these lessons to guide you through the basics, making sure to go over definitions, terminology, and important information about scientists who have contributed to the theories about evolution. Use your favorite device to go through the lesson materials, and remember that everything we offer is online, so you can always take your study materials with you. Plus, if you get stuck, you can send any of your questions to our instructors. In these lessons, you will learn:

  • To understand the concept of evolution and related theories
  • What are adaptation and the natural selection process
  • How to identify different kinds of natural selection

6 Lessons in Chapter 14: Basics of Evolution
Test your knowledge with a 30-question chapter practice test
Theories of Evolution: Lamarck vs. Darwin

1. Theories of Evolution: Lamarck vs. Darwin

We'll look at the interplay between population genetics and environment. Are traits individually acquired or do entire populations evolve? The flying hamsters and a few other notable experiments will provide the answers.

Natural Selection & Adaptation: Definition, Theory & Examples

2. 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.

Natural Selection: Definition, Types & Examples

3. 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.

Speciation: Allopatric and Sympatric Speciation

4. Speciation: Allopatric and Sympatric Speciation

Discover the definition of a species and learn more about how species split. Find out common terms related to the splitting of species and study what role polyploidy plays in the development of a species.

Prezygotic Reproductive Barriers & Speciation: Definition & Examples

5. Prezygotic Reproductive Barriers & Speciation: Definition & Examples

We may take for granted why animals choose to mate with other animals of similar appearance, but it's not that simple. There are actually biological barriers to reproduction that can prevent even seemingly closely related species from reproducing. This lesson looks at one such category of hindrances, prezygotic barriers, which make fertilization impossible.

Postzygotic Reproductive Barriers: Definition & Examples

6. Postzygotic Reproductive Barriers: Definition & Examples

Do flying hamsters represent a separate species from your run-of-the-mill hamsters? We'll get to the bottom of this by performing crosses between the two hamster types. You'll explore postzygotic reproductive barriers and their possibly tragic consequences.

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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