About This Chapter
Praxis Biology: Mutations and Other Genetic Changes - Chapter Summary
Prepare for your Praxis II Biology Content Knowledge exam with this 'no nonsense' guide to the possible changes in cells' DNA sequences. You can learn how alterations affect protein performance within the silent, missense and nonsense forms of mutations.
This chapter helps you understand what causes mutations, in addition to other genetic changes, and how our surroundings affect the pace at which mutations occur. The lessons provide valuable information about the following biology concepts:
- Mutations and protein function
- Frameshift mutations
- The environment's effect on mutation rates
- Germ-line, somatic and inversion mutations
- Mutation triggers
- Bacterial conjugation, transduction and transformation
Knowledgeable professionals present our videos on mutations and other genetic changes. Each lesson includes a video, a written transcript, video tags and a quiz. Many lessons also contain links to extra text lessons on related topics.
Praxis Biology: Mutations and Other Genetic Changes Objectives
Two portions of the Praxis II Biology Content Knowledge exam have questions linked to the topics in this chapter. The section concerning cellular and molecular biology, along with the part about classical genetics and evolution, compose about 40% of the exam and present approximately 61 questions. Your understanding of the nature of mutations and genetic variation is essential.
The format for the biology content knowledge test is multiple-choice, and you can choose either paper or computer delivery. The quizzes that accompany each lesson can be beneficial in giving you experience with the types of questions you might see on test day.
1. Effects of Mutations on Protein Function: Missense, Nonsense, and Silent Mutations
How does a tiny point mutation change the way a protein works? What are the consequences of base substitutions? In this lesson, we'll use an imaginary creature to explore missense, nonsense and silent mutations.
2. Effects of Frameshift Mutations: Definitions and Examples
What is a frameshift in genetic translation? How can a frameshift mutation change a protein? In this lesson, learn about the codon reading frame and how frameshift mutations cause serious problems for polypeptide formation.
3. Mutagens: How the Environment Affects Mutation Rates
What causes mutations to occur in living things? How do we avoid mutations? Are mutations always bad? Discover answers to these questions and more in this lesson on mutagens.
4. The Difference Between Germline & Somatic Mutations
Cell mutate and different types of cells give rise to mutations with different effects. In this lesson, you will learn how a germinal mutation differs from a somatic mutation and which type can be passed down to future generations.
5. Causes of Mutations: Recombination & Translocation
DNA can be exchanged between chromosomes through the processes of translocation and recombination. Learn more about these processes and how they differ from one another in this lesson.
6. Inversion Mutations: Causes & Effects
Inversion mutations are one type of genetic mutation that creates changes in a chromosome. In this lesson, you'll learn about what causes an inversion mutation and the effects of the mutation.
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