About This Chapter
Overview of Evolution & Natural Selection - Chapter Summary
Our biology experts have created this comprehensive chapter to give you a solid overview of the theories and mechanics of evolution. They will give you background information about Darwin's and Lamarck's theories and then present the scientific evidence supporting those theories. This chapter can also you the knowledge to compare different selection mechanisms which lead to speciation as well as equations for the rates of these changes. You will also learn to define and give examples of the key evolutionary concepts. When you have finished your study of this chapter, you should feel confident to do the following:
- Compare the theories of Lamarck and Darwin
- Describe the evidence supporting evolutionary theory
- Explore rates of evolution
- Explain the Hardy-Weinberg Equilibrium
- Summarize speciation, genetic variability, and random mutation
- Compare natural and artificial selection
- Explain causes and impact of mass extinction
The lessons in this chapter are primarily presented through short, engaging videos organized and narrated by our professional instructors. While watching, you can use the Timeline feature of the video player to review specific key ideas in each lesson. You might also find the accompanying transcript helpful for your studying. Be sure to use the self-assessment quizzes at the end of the lesson to evaluate your level of mastery of these important biology concepts and track your progress on your Dashboard.
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.
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.
3. Rates of Evolution: Punctuated Equilibrium & Molecular Clock Hypothesis
In general, evolution is a very long process. But rates of evolution can be different for different organisms. In this video lesson, you will identify how scientists study rates of evolution and fill in some of the missing 'steps' in the fossil record.
4. Hardy-Weinberg Equilibrium: Definition, Equation & Evolutionary Agents
In this lesson we will define Hardy-Weinberg equilibrium and break down the Hardy-Weinberg equation to figure out if a population of hypothetical beetles is evolving.
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.
6. 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.
7. Genetic Variability and Random Mutation
Evolution is driven by variation among populations. The amount of variability determines how well a population can adapt to environmental changes, while random mutations can provide new variations that help a population adapt to unexpected changes.
8. Artificial Selection in Evolution
Humans have been selectively breeding for desirable traits in plants and animals for a long time. This artificial selection allows for a lot of control in the breeding process but can also lead to unintended mutations within a population of organisms.
9. What Is Extinction? - Defining Background and Mass Extinction
In this lesson you'll discover what the term 'extinction' means as well as learn the two different types of extinction: mass extinction and background extinction. You will also discover how humans contribute to extinction events.
Earning College Credit
Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.
To learn more, visit our Earning Credit Page
Transferring credit to the school of your choice
Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.
Other chapters within the FTCE Middle Grades General Science 5-9 (004): Test Practice & Study Guide course
- Structure and Behavior of Matter
- Trends of the Periodic Table
- Gas Laws
- Properties of Waves
- Electricity and Magnetic Force
- Basics of Thermodynamics
- The Electromagnetic Spectrum and Electric Units
- Plate Tectonics and Dating Methods
- Cycles and Layers of the Earth
- Space Science
- Cell Biology & Division
- Chemical Reactions of Metabolism
- Biology of Genetics
- Plant Biology Overview
- Human Anatomy & Physiology Overview
- Organism Classification & Phylogenesis
- Ecology & Florida
- Scientific Principles
- The Science Learning Environment
- FTCE Middle Grades General Science 5-9 Flashcards