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Ch 22: Praxis Biology & General Science: Human Genetics

About This Chapter

Let us teach you about genetics. The video lessons and self-assessment quizzes in this chapter can help you correctly answer questions about evolution and classical genetics on the Praxis II Biology and General Science test.

Genetics - Chapter Summary

Explore research methods in human genetics, including pedigree analysis and population genetics, through this series of video lessons. Developed by our team of experienced professional educators, this chapter can help you prepare for the Praxis II: Biology and General Science test.

By the time you've completed this chapter, you'll understand the pros and cons of prenatal and postnatal genetic testing, as well as the causes, symptoms and - when available - treatments of a number of genetic diseases, including Tay-Sachs disease, hemophilia and Huntington's disease. Other topics addressed in our brief video lessons include the following:

  • Phenotypic variability in genetic disorders
  • Haplosufficient genes and inheritance patterns of lethal alleles
  • Features, genetic cause and treatment of retinoblastoma
  • Cancer syndromes and genetic risk factors for cancer
  • Sex determination, X-inactivation and Barr bodies
  • Turner syndrome and trisomy X
  • Klinefelter and XYY syndrome

Genetics Objectives

Several states use the Praxis II: Biology and General Science test as part of the certification process for public high school science teachers. Administered by Educational Testing Service, this 2-hour exam covers eight content categories. The category evolution and classical genetics comprises approximately 15% of the test's 120 multiple-choice questions.

This chapter on genetics uses everyday terms and concepts to help you prepare for the Praxis II: Biology and General Science test. Each video lesson is accompanied by a written transcript, several of which link to additional learning resources, as well as a multiple-choice self-assessment quiz.

14 Lessons in Chapter 22: Praxis Biology & General Science: Human Genetics
Human Genetics Research Methods: Pedigrees and Population Genetics

1. 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.

Pedigree Analysis in Human Genetics: Tutorial

2. Pedigree Analysis in Human Genetics: Tutorial

One of the oldest genetic techniques is pedigree analysis, and yet it is still used every day all around the world by doctors, geneticists, and genetic counselors. Building and reading a pedigree is actually fairly easy if you know what the symbols mean. In fact, it's so easy that you can learn how to do it in less than ten minutes if you watch this video!

Pedigree Analysis in Human Genetics: Inheritance Patterns

3. Pedigree Analysis in Human Genetics: Inheritance Patterns

So you've learned what a pedigree is and how to read or even create one. Now you're ready to learn how to analyze a pedigree and figure out what kind of inheritance pattern a genetic condition follows!

Genetic Disorders: Penetrance & Phenotypic Variability

4. 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!

What Is Tay-Sachs Disease? - Symptoms and Genetic Cause

5. What Is Tay-Sachs Disease? - Symptoms and Genetic Cause

Tay-Sachs is a devastating genetic disorder that is seen in infants starting when they are only three to six months old. Children who suffer from this disease usually die by the age of four. Learn more about the symptoms and genetic causes of this autosomal recessive disorder.

Haplosufficient Genes and Inheritance Patterns of Lethal Alleles

6. Haplosufficient Genes and Inheritance Patterns of Lethal Alleles

Have you ever wondered why some genetic conditions are recessive while others are dominant? In this lesson, you'll learn about haplosufficiency and how it can sometimes determine whether a genetic condition is dominant or recessive.

What Is Hemophilia? - Symptoms, Genetic Cause & Treatment

7. What Is Hemophilia? - Symptoms, Genetic Cause & Treatment

In this lesson, you'll learn about a group of hereditary bleeding disorders collectively known as hemophilia. You'll learn why afflicted people don't form blood clots and why most hemophiliacs are males.

What Is Huntington's Disease? - Symptoms, Genetic Cause & Treatment

8. What Is Huntington's Disease? - Symptoms, Genetic Cause & Treatment

In this lesson, you'll learn about a neurodegenerative disorder called Huntington's disease. You'll learn what a CAG repeat is, and how the number of these repeats can be used to predict whether or not a person will get Huntington's disease.

Tumor Suppressor Genes: Retinoblastoma Features, Genetic Cause & Treatment

9. Tumor Suppressor Genes: Retinoblastoma Features, Genetic Cause & Treatment

In this lesson, you'll learn about retinoblastoma, which is a rare childhood cancer of the retina. Retinoblastoma is often inherited in an autosomal dominant fashion. Find out why retinoblastoma and other types of hereditary cancers are caused by dominant alleles by watching this lesson.

Cancer Syndromes & Genetic Risk Factors for Cancer

10. Cancer Syndromes & Genetic Risk Factors for Cancer

This lesson describes something called cancer syndrome or family cancer syndrome, as well as the important clues that can help it be detected and two examples of such a condition.

Sex Determination, X-Inactivation, and Barr Bodies

11. Sex Determination, X-Inactivation, and Barr Bodies

Sex determination, X-inactivation and Barr bodies are complex chromosomal processes. Learn more about each of these processes and test your knowledge with a quiz.

Turner Syndrome and Trisomy X: Types of Sex Chromosome Aneuploidy

12. Turner Syndrome and Trisomy X: Types of Sex Chromosome Aneuploidy

Most females have two X chromosomes, which is what makes them women. But what happens when there are more or less than two X chromosomes in a woman's DNA? In this lesson, we'll explore Turner syndrome and Trisomy X.

Klinefelter and XYY Syndrome: Types of Sex Chromosome Aneuploidy

13. Klinefelter and XYY Syndrome: Types of Sex Chromosome Aneuploidy

Most boys and men have two sex chromosomes. But what happens when a male has more than two sex chromosomes? In this lesson, we'll explore two examples of male aneuploidy: Klinefelter Syndrome and XYY Syndrome.

How Prenatal and Postnatal Genetic Testing Works

14. How Prenatal and Postnatal Genetic Testing Works

Have you ever wondered why pregnant women have so many doctor visits and need so many tests done? Learn more about how prenatal and postnatal genetic testing works and test your knowledge with a quiz.

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Other Chapters

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