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Ch 17: Holt McDougal Biology Chapter 17: The Tree of Life

About This Chapter

The Tree of Life chapter of this Holt McDougal Biology Companion Course helps students learn the essential lessons associated with the tree of life. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Tree of Life textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Tree of Life chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the tree of life topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Classification of living things
  • Definition of an organism
  • Cladograms and phylogenetic trees
  • Molecular clocks provided by mitochondrial DNA and ribosomal RNA
  • Three domains of the tree of life

Holt McDougal is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

6 Lessons in Chapter 17: Holt McDougal Biology Chapter 17: The Tree of Life
Taxonomy: Classification and Naming of Living Things

1. 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.

Organism: Definition & Explanation

2. Organism: Definition & Explanation

An organism is any living thing. There are millions of organisms, so how do scientists organize them all? Learn more about the diversity of life on Earth and how scientists classify them, then take a quiz to test your knowledge!

Cladograms and Phylogenetic Trees: Evolution Classifications

3. Cladograms and Phylogenetic Trees: Evolution Classifications

Family trees help show how people are related to each other. Similarly, scientists use cladograms and phylogenetic trees to study the relationships between organisms.

Rates of Evolution: Punctuated Equilibrium & Molecular Clock Hypothesis

4. 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.

How Mitochondrial DNA & Ribosomal RNA Provide Molecular Clocks

5. How Mitochondrial DNA & Ribosomal RNA Provide Molecular Clocks

In this lesson, we explore keeping time and dating evolution by tracking genetic mutations in our favorite molecular clocks: mitochondrial DNA and ribosomal RNA.

Tree of Life Domains: Bacteria, Archaea & Eukarya

6. Tree of Life Domains: Bacteria, Archaea & Eukarya

In this lesson we will consider how all the organisms on Earth are related to one another and the favored hypothesis for how all these organisms fit into three broad categories called domains.

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