Ch 28: Theory & Mechanisms of Evolution

About This Chapter

This chapter contains several text and video lessons that review important aspects of evolutionary theory. Review these lessons to learn about the current scientific understanding of how evolution works and the theory of punctuated equilibrium.

Theory & Mechanisms of Evolution - Chapter Summary

The theory of evolution is arguably the most one of the most significant principles in biology. Given its importance, no attempt at understanding biology would be complete without a thorough understanding of the theory and mechanisms of evolution. You can learn about these topics by reading or watching the text and video lessons in this chapter on evolutionary theory, acquired traits and how populations evolve.

Each of these lessons go over the main points of different elements related to the theory of evolution, such as the paleontology, biogeography, embryology, comparative anatomy and molecular biology evidence in support of this theory. Included in this chapter are lessons on:

  • The theory of evolution
  • Natural selection and the process of adaptation
  • Hypothesis of punctuated equilibrium
  • Types and barriers of speciation
  • The evidence for evolution

Each of the video lessons in this chapter contains helpful tags that will allow you to instantly locate and jump to the main points on that particular topics. The chapter also offers you complete transcripts of each video for your own convenience. Once you feel comfortable with your understanding of these points, you can answer the questions in the chapter's practice quizzes and final exam to make sure that you accurately recall the main points on this subject.

5 Lessons in Chapter 28: Theory & Mechanisms 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 Processes

2. Natural Selection & Adaptation Processes

Through the process of adaptation, natural selection shapes the variety of life that exists around us. This lesson will explore some of the ways this process can take place.

Punctuated Equilibrium: Definition, Theory & Examples

3. 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.

Overview of Speciation Types & Barriers

4. Overview of Speciation Types & Barriers

Have you ever wondered how a new species arises? This lesson will examine speciation, or when a new species forms, as well as barriers that prevent separate species from mating.

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

5. 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.

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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Other Chapters

Other chapters within the Pennsylvania Grades 4-8 - Science Subject Concentration (5159): Practice & Study Guide course