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Ch 19: Principles of Evolution: Help and Review

About This Chapter

The Principles of Evolution chapter of this College Biology Help and Review course is the simplest way to master evolutionary principles. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of evolution.

Who's it for?

Anyone who needs help learning or mastering college biology material will benefit from taking this course. There is no faster or easier way to learn college biology. Among those who would benefit are:

  • Students who have fallen behind in understanding natural selection and speciation
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning science (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about principles of evolution
  • Students who struggle to understand their teachers
  • Students who attend schools without extra science learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the Principles of Evolution chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Principles of Evolution chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any principles of evolution question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

In this chapter, you'll learn the answers to questions including:

  • What are the guiding principles behind the theory of evolution?
  • How does the Hardy Weinberg equation work?
  • How do adaptation and natural selection occur?
  • What does allopatric and sympatric speciation mean?
  • How are prezygotic and postzygotic barriers defined?

15 Lessons in Chapter 19: Principles of Evolution: Help and Review
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.

Hardy Weinberg Equilibrium I: Overview

2. Hardy Weinberg Equilibrium I: Overview

In this lesson, we'll examine population genetics in greater detail. We'll also explore notions of Hardy-Weinberg equilibrium for large, stable populations. Is the genetic makeup of our flying hamster population changing? The Hardy-Weinberg equilibrium can serve as a reference point as we try to answer population genetics questions.

Hardy Weinberg Equilibrium II: The Equation

3. Hardy Weinberg Equilibrium II: The Equation

The Hardy-Weinberg equilibrium equation is represented by a polynomial, so we'll have to do some calculations. Don't be intimidated; a few coin tosses can help us make sense of allelic frequencies in a given gene pool.

Hardy Weinberg Equilibrium III: Evolutionary Agents

4. Hardy Weinberg Equilibrium III: Evolutionary Agents

In this lesson, you'll learn how the Hardy-Weinberg equation relates to different evolutionary agents and population changes. Discover how the equation may be used to discover populations that are not in equilibrium.

Natural Selection & Adaptation: Definition, Theory & Examples

5. 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

6. 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

7. 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

8. 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

9. 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.

Selective Pressure: Definition & Example

10. Selective Pressure: Definition & Example

Because of selective pressures, organisms with certain phenotypes have an advantage when it comes to survival and reproduction. Over time, this leads to evolution. In this lesson, you'll learn about various selective pressures and their consequences.

Darwin's Theory of Natural Selection: Overview

11. Darwin's Theory of Natural Selection: Overview

In this lesson, you will be introduced to Charles Darwin and his theory of natural selection. You will also learn a bit about how his ideas impacted science, popular understandings of human origins, and those who, to this day, rail furiously against the very idea of evolution.

Disruptive Selection: Example, Definition & Graph

12. Disruptive Selection: Example, Definition & Graph

How do new species develop? One evolutionary mechanism that may be at play is disruptive selection. Though rare in nature, this process favors extreme traits over those that are more intermediate.

Emergent Properties: Definition & Examples

13. Emergent Properties: Definition & Examples

Living organisms, from the simplest bacteria to human beings, display levels of organization. Complete this lesson to find out how emergent properties arise at each level - from simple atoms to the biosphere. After the lesson, there will be a quiz to test what you have learned.

Jean-Baptiste Lamarck's Theory of Evolution: Overview

14. Jean-Baptiste Lamarck's Theory of Evolution: Overview

You might know about Charles Darwin and his theory of evolution. However, it was the lesser known, yet influential, Jean-Baptiste Lamarck who put forth a theory that laid the early foundations for the study of evolution.

Abiogenesis: Definition, Theory & Evidence

15. Abiogenesis: Definition, Theory & Evidence

This lesson defines abiogenesis and discusses the evidence which supports the theory. This lesson will discuss primitive Earth and the possibilities of how the first life on Earth started from a purely scientific perspective.

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