About This Chapter
Speciation, Extinction & Taxonomy - Chapter Summary
In this chapter, the lessons take you through how species are classified and named, and how the theory of evolution is supported by many branches of the life and other sciences. You will review the differences between allopatric and sympatric speciation, how and why species become extinct and other related information. The lessons present the following material and more:
- Definition and explanation of extinction
- Types of speciation, including prezygotic and postzygotic barriers
- Examples and explanation of adaptive radiation
- Taxonomy and binomial nomenclature
- Evolution evidence from the biological sciences and more
- Similarities and differences in cross-species body structures
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1. 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.
2. 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.
3. 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.
4. 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.
5. Adaptive Radiation: Definition & Example
Adaptive radiation is when members of a single group or lineage evolutionarily diverge into a variety of different forms. These forms are dictated by selection pressures and the use of habitats or resources.
6. Binomial Nomenclature: Definition, Classification & System
Life on Earth is incredibly diverse, with over one million species. But have you ever wondered how all these organisms are named? In this lesson, you'll learn about the scientific naming system called binomial nomenclature.
7. Taxonomy: Classification and Naming of Living Things
The name you give to a living thing may be completely different than the name someone else uses. In science, we use a common naming system for all living things to avoid confusion. This lesson will explore the basics of our classification system.
8. 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.
9. Homologous Structures: Comparison of Body Structures Across Species
Did you know that you share the same structures as a monkey? Okay, you may have guessed that, but what about a whale or a bat? Learn about similarities in bone and muscle structure in this lesson that covers body shape across species.
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