Ch 36: TExES Science 7-12: Basic Genetics

About This Chapter

In this chapter, you will review Mendel's laws, the properties of alleles and chromosomes, human genetics and genetic mutations as you study for the TExES Science 7-12 exam.

TExES Science 7-12: Basic Genetics - Chapter Summary

These lesson videos feature lectures by our professional instructors about the genetic inheritance of traits, human genetics and genetic mutations. Use these lessons to prepare for related questions on the Texas Examinations of Educator Standards (TExES) Science 7-12 exam regarding:

  • The properties of alleles and chromosomes
  • Mendel's first and second law of genetic inheritance
  • Simple dominance, codominance and incomplete dominance
  • Independent assortment, sex linked and sex limited traits
  • Model organisms and human genetic research methods
  • Penetrance and phenotypic variability of genetic disorders
  • Types, processes and effects of point mutations
  • Mutagens and environmental effects on mutation rate

For an additional review of these lessons, read the lesson transcripts. These written overviews of the lessons will help you reinforce your retention of the material presented in the lessons videos and study the key vocabulary of the chapter. After you've completed your review of the material in a lesson, take the lesson's quiz to identify topics you don't understand. Then improve your understanding of these topics by returning to the lessons with the video tags.

12 Lessons in Chapter 36: TExES Science 7-12: 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: 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.

Mendel's Second Law: The Law of Independent Assortment

4. 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.

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.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 160 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Other Chapters

Other chapters within the TExES Science 7-12 (236): Practice & Study Guide course

Support