Ch 9: Genetics & Hereditary Traits

About This Chapter

Watch video lessons to learn more about genetics and the hereditary traits that are passed on from parents to children. After each lesson, you'll also find a handy online quiz, which can help you determine how well you understood these challenging topics.

Genetics and Hereditary Traits - Chapter Summary and Learning Objectives

The study of genetics and hereditary traits includes exploring how the genes for certain characteristics are carried within cells and how those characteristics are passed on from parent to child. Through video lessons led by a qualified life science instructor, you'll learn about Punnett squares and how to use them to predict how traits could get passed on. You'll also learn about the alleles that hold genetic information, and what kinds of traits are X or Y chromosome specific. At the end of this chapter, you should be able to:

  • Define genetics
  • Demonstrate how to use a Punnett square
  • Describe the purpose of alleles in the transfer of genetic material
  • Discuss what happens when genes have more than one allele

Video Objective
Genetics and Punnett Squares: Getting Traits from Parents Explain what a Punnett square is; describe how one is used to illustrate how an offspring gets traits from the parents and how it demonstrates the possible combinations of inherited traits.
Properties of Alleles Describe the properties of genes that get passed from parent to offspring that contain the genetic code for specific traits.
Incomplete Dominance: Genes with Multiple Alleles Discuss the transfer of genetic material when no allele dominates the others.
Sex-Linked Traits on the X and Y Chromosomes Discuss hereditary traits that are sex-specific and tied to X chromosomes and Y chromosomes.

5 Lessons in Chapter 9: Genetics & Hereditary Traits
Test your knowledge with a 30-question chapter practice test
Genetics and Punnett Squares: Getting Traits from Parents

1. Genetics and Punnett Squares: Getting Traits from Parents

You are the genetic product of your parents, but you could have ended up differently if they had passed on different genetic information to you. Punnett squares are a useful tool to help us identify all the possible genotypes of the offspring of two parents.

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.

Incomplete Dominance of Gene Alleles

3. Incomplete Dominance of Gene Alleles

Genetics are complicated, and sometimes alleles affect an organism's appearance in tandem instead of one dominating over the other. This can produce a blended appearance, but without blending the actual alleles themselves.

Codominance & Genes with Multiple Alleles

4. Codominance & Genes with Multiple Alleles

Some genes have more than two alleles, which increases the possible genetic outcomes for offspring. And as we'll see in this lesson, sometimes those alleles work together to produce a codominant phenotype.

Sex-Linked Traits on the X and Y Chromosomes

5. Sex-Linked Traits on the X and Y Chromosomes

The sex chromosome you inherit from your parents determines whether you are male or female. But many genes are carried on these chromosomes as well, and the inheritance of this genetic information works a bit differently.

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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