Ch 47: Evolution - ORELA Middle Grades General Science

About This Chapter

As you prepare for the ORELA Middle Grades General Science assessment, watch short video lessons that explore evolution. These lessons can give you insight into natural selection, speciation and other topics covered on the exam.

Evolution: ORELA Middle Grades General Science - Chapter Summary

Studying for the ORELA Middle Grades General Science assessment could mean revisiting topics you no longer recall. This chapter refreshes your knowledge of evolution to ensure you can answer questions that address the following:

  • Describing the theory of evolution
  • Examining the notions, equations and evolutionary agents of Hardy-Weinberg equilibrium
  • Analyzing natural selection and adaptation
  • Identifying types of natural selection
  • Exploring allopatric and sympatric speciation
  • Discussing prezygotic and postzygotic barriers

The lessons offer in-depth explanations with visual infographics that help you better understand evolution. Averaging about 10 minutes apiece, the videos can help you quickly and easily get reacquainted with the subject matter to enhance your exam preparations.

Evolution: ORELA Middle Grades General Science Chapter Objectives

The ORELA Middle Grades General Science assessment is offered in Oregon as a way for educators to get the licensure necessary to teach the subject in classrooms. The test is broken into four content domains. Topics covered in this chapter on evolution are found in the life science domain, which constitutes about 25% of the total test. Studying for questions in this section improves your chances of earning a passing score of 228 or higher.

The computer-based test consists of 150 multiple-choice questions. Self-assessment quizzes are included with the lessons in this chapter, and they can be helpful in gauging your comprehension of evolution while giving you practice in answering questions similar in format to those on the test. If you're unclear about any lesson topic, submit your questions to our experts.

9 Lessons in Chapter 47: Evolution - ORELA Middle Grades General Science
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.

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.

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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