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Ch 29: Praxis Middle School Science: Basic Genetics

About This Chapter

Let us help you review the essentials of middle school genetics in preparation for the Praxis Middle School Science test. Our video lessons and self-assessment quizzes provide the information you need to feel confident about basic genetics.

Praxis Middle School Science: Basic Genetics - Chapter Summary

In our video lessons, expert instructors will help walk you through the important concepts of basic genetics that you may encounter on the Praxis Middle School Science test. The videos cover the following topics:

  • Allele characteristics and properties
  • Definition and application of Mendel's First and Second laws
  • Exceptions to simple dominance and independent assortment
  • Codominance & incomplete dominance
  • Sex-linked and sex-limited traits
  • Chromosomal linkage
  • Research methods in human genetics
  • Population genetics
  • Penetrance and phenotypic variability of genetic disorders
  • Point mutations and mutagens

The lessons have been created to be brief but thorough and engaging. Each lesson is followed by a short multiple-choice quiz so you can gauge your comprehension and retention of the material and go back over any problem areas.

Praxis Middle School Science: Basic Genetics Chapter Objectives

The Praxis Middle School Science exam assesses your knowledge and comprehension of science to determine your readiness for teaching science to middle schoolers. The topics covered in this chapter on basic genetics correspond to objectives assessed in the life sciences section of the exam, which constitutes about 24% of the exam (and includes other life sciences topics besides genetics).

Objectives pertaining to genetics that may be covered in the life sciences section of the exam include understanding DNA structure; replication, transcription and translation; dominant and recessive alleles; Mendelian inheritance; mutations, chromosomal abnormalities and common genetic disorders in humans. The self-assessment quizzes following our lessons will also introduce you to the types of questions you may encounter on the actual exam. The Praxis test is computer-based with 125 total questions.

12 Lessons in Chapter 29: Praxis Middle School Science: Basic Genetics
Test your knowledge with a 30-question chapter practice test
Genetics: Heredity, Traits & Chromosomes

1. Genetics: Heredity, Traits & Chromosomes

We view manipulation of genes in our crops and livestock as a recent development. Yet, man has been manipulating the genetic makeup of his food for thousands of years through cultivation and breeding. This lesson will begin to help you understand how genetics works.

Properties of Alleles

2. Properties of Alleles

What is a dominant phenotype and how will it affect Adrian's flying hamster research? Tune in as he studies homozygous and heterozygous genotypes and the phenotypes they produce.

Mendel's First Law & Its Application

3. Mendel's First Law & Its Application

Genetics is a fascinating and confusing world. This lesson will delve into Gregor Mendel's First Law, or the Law of Segregation, explaining what it means and how you can use it.

Mendel's Second Law & Its Application

4. Mendel's Second Law & Its Application

In this lesson, we'll explore how genes can assort independently according to Mendel's second law. We'll also use Punnett squares to see whether or not genes are linked and how this relates to research.

Exceptions to Simple Dominance: Codominance and Incomplete Dominance

5. Exceptions to Simple Dominance: Codominance and Incomplete Dominance

Have you ever wondered what it means if someone is a universal donor or acceptor of blood? See how genetic interactions play a key role in this trait.

Exceptions to Independent Assortment: Sex-Linked and Sex-Limited Traits

6. Exceptions to Independent Assortment: Sex-Linked and Sex-Limited Traits

More men are color blind compared women. But often, not every brother, cousin or uncle in a family tree is color blind. Why not? How can genetics explain this seemingly complex inheritance pattern?

Crossing Over & Gene Linkage: Definition, Importance & Results

7. Crossing Over & Gene Linkage: Definition, Importance & Results

During this latest development of his flying hamster experiments, Adrian must learn about linked genes and recombinant chromosomes to unlock the mystery of the fire-breathing hamster. In this lesson, you'll look at another exception to Mendel's law of independent assortment.

Human Genetics: Multifactorial Traits & Model Organisms

8. Human Genetics: Multifactorial Traits & Model Organisms

How do we study human genetics when most traits arise from multiple genes? It's certainly more complicated that drawing a simple Punnett square. Never fear, for model organisms are here!

Human Genetics Research Methods: Pedigrees and Population Genetics

9. Human Genetics Research Methods: Pedigrees and Population Genetics

Have you ever wondered how people study human genetics? Do you know what a pedigree or a complex disease is? In this lesson you'll learn about some of the techniques that human geneticists use and what pedigrees and complex diseases have to do with human genetics.

Genetic Disorders: Penetrance & Phenotypic Variability

10. Genetic Disorders: Penetrance & Phenotypic Variability

Did you know that sometimes a dominant human genetic condition will skip a generation in a family? It does happen, and some dominant genetic conditions will also have a wide range of phenotypes, sometimes even within the same family. Learn more in this lesson about phenotypic variability!

Point Mutations: Types, Processes & Effects

11. Point Mutations: Types, Processes & Effects

You might not think about your DNA that often, but you would probably notice if something was mutated on your DNA! This lesson will discuss what happens when your DNA gets mutated, focusing specifically on point mutations and their impacts.

Mutagens: How the Environment Affects Mutation Rates

12. 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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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