Ch 20: Praxis Biology & General Science: Genetics and Inheritance

About This Chapter

Our lessons can give you an in-depth look at genetics and inheritance. Prepare for the Praxis II Biology and General Science exam with lessons on alleles, Mendel's laws, chromosomal linkage and more.

Praxis Biology & General Science: Genetics and Inheritance - Chapter Summary

Use the materials found in this chapter to help you prepare for the Praxis II Biology and General Science test. Get started by finding out about genetic selection and the practical applications for Mendel's laws. You'll also find definitions for key words like genotype, phenotype, chromosomes and alleles. As you continue through this chapter you'll find in-depth lessons on the following topics:

  • Allele properties
  • Mendel's first and second laws
  • The states of codominance and incomplete dominance
  • Exceptions to independent assortment
  • Crossing over and recombinant chromosomes
  • Methods for studying human genetics

Experienced and professional instructors lead these videos that contain plenty of examples and engaging graphics to help you learn the critical components of genetics and inheritance. Once you've finished watching the video lessons, you can take the self-assessment quizzes to determine how well you grasp the information.

Praxis Biology & General Science: Genetics and Inheritance Objectives

Aspiring biology or general science teachers in many states will need to take the Praxis II Biology and General Science test, which is used to assess candidates' readiness to teach these topics to students. Genetics and inheritance are topics found in the evolution and classical genetics content area of the test. This section has 18 questions and represents approximately 15% of the entire test. The questions on the biology and general science test are all multiple-choice questions. You can prepare for the format of the questions on this test with the quizzes that follow each of the lessons.

10 Lessons in Chapter 20: Praxis Biology & General Science: Genetics and Inheritance
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: The Law of Segregation

3. Mendel's First Law: The Law of Segregation

Breaking up is a hard thing to do, but homologous chromosomes always go their separate way. What effect does chromosome segregation have on genetics? We look once more to Adrian's flying hamsters for answers.

Application of Mendel's First Law

4. Application of Mendel's First Law

Hollywood Squares? No, it's Punnett Squares! Those wacky diagrams are a geneticist's best friend. See how they turn geneticists into soothsayers, predicting the genotypic and phenotypic future.

Mendel's Second Law: The Law of Independent Assortment

5. Mendel's Second Law: The Law of Independent Assortment

Understanding how Mendel's law of independent assortment describes inheritance of genes is as easy as flipping a coin. Grab a few coins, cue up the video and see how.

Mendel's Dihybrid Cross Example: Practice & Ratio

6. Mendel's Dihybrid Cross Example: Practice & Ratio

Oh no! Twice the genes and sixteen genotypes - a dihybrid cross seems overwhelming to understand. Never fear though, Punnett squares will save the day!

Exceptions to Simple Dominance: Codominance and Incomplete Dominance

7. 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

8. 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

9. 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

10. 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!

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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