About This Chapter
Speciation & Evolution - Chapter Summary
This helpful online biology chapter covers the fundamentals of evolution and speciation. Inside the chapter, you'll find a series of bite-sized lessons that examine the concepts of natural selection, adaptation, the theory of evolution, the process of speciation and more. Work through the chapter at your own pace and be sure to take the accompanying self-assessment quizzes to reinforce your understanding of the lesson topics. Our instructors are available to answer your questions, and you can access the chapter at any time using your computer or mobile device. By the end of the chapter, you should be equipped to:
- Define natural selection, adaptation and the Hardy Weinberg equilibrium
- Differentiate between various types of natural selection
- Evaluate allopatric and sympatric speciation
- Identify prezygotic and postzygotic barriers
- Explain the theory of evolution
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. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
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