Ch 9: Mendel & Gene Expression

About This Chapter

Let us help you understand the contributions of Gregor Mendel to the field of genetics with the interesting video lessons and quizzes in this chapter. Prepare for an upcoming project or test by using the flexible, mobile-friendly learning tools provided here.

Mendel & Gene Expression - Chapter Summary

The life and biography of Gregor Mendel, known as the Father of Modern Genetics, is described in this chapter. Genotypes and the major role they play in determining how we look is introduced, as well as the concept of multiple alleles complete with examples from nature. The Rh factor and why blood compatibility during pregnancy is essential will also be presented.

You will learn about DNA fingerprinting and why it's used, dihybrid crosses and the Human Genome Project. This chapter will prepare you to:

  • Define monohybrid and the characteristics they predict
  • Differentiate between genes and alleles
  • Explain how dominant and recessive phenotypes work
  • Describe how codon recognition works
  • Outline the different blood types and how they're passed from parent to child
  • Detail how polygenic inheritance designates many physical traits
  • Build and read a pedigree analysis in less than ten minutes
  • Give examples of gene linkage

Watch our video lessons and take our quizzes on any mobile device at any time, 24 hours a day. Our instructors are available to offer you more help if you struggle with any of the subjects you find in our chapters. If you prefer hard-copy paper study guides, use our printable video transcripts.

17 Lessons in Chapter 9: Mendel & Gene Expression
Test your knowledge with a 30-question chapter practice test
Gregor Mendel & Genetics: Experiments, Laws & Discovery

1. Gregor Mendel & Genetics: Experiments, Laws & Discovery

Gregor Mendel is currently known as the Father of Modern Genetics. This lesson goes through a brief history of his life, workings as a scientist, and his findings.

Monohybrid Cross: Definition & Example

2. Monohybrid Cross: Definition & Example

Some genetic characteristics are inherited in predictable patterns. In this lesson you will learn what monohybrids are and how to predict the kinds of characteristics that their offspring will show.

Difference Between Genes & Alleles

3. Difference Between Genes & Alleles

Genes are passed from parent to child. Each parent provides one variation of the gene, called an allele, to the child. This lesson will discuss how genetic information is inherited and how it is expressed.

What are Genotypes? - Definition & Examples

4. What are Genotypes? - Definition & Examples

In this lesson, you will learn about what genotypes are, where they come from and how they play a major role in determining how your body works and what you look like.

Differences Between Dominant & Recessive Phenotypes

5. Differences Between Dominant & Recessive Phenotypes

In this lesson, we're going to compare and contrast dominant and recessive phenotypes. Here, you'll understand differences in how genes create dominant versus recessive phenotypes, how they are inherited, and different types of dominant and recessive inheritance.

Codon Recognition: How tRNA and Anticodons Interpret the Genetic Code

6. Codon Recognition: How tRNA and Anticodons Interpret the Genetic Code

How does codon recognition work at the molecular level? Can you use tRNA and anticodons to decipher the genetic code? Learn the mechanics of codon recognition and build a polypeptide from a sample genetic code.

Multiple Alleles: Definition & Example

7. Multiple Alleles: Definition & Example

This lesson introduces the concept of multiple alleles. It provides the definition of multiple alleles and presents several examples of this type of trait within both human and animal populations.

Blood Type Inheritance in Humans

8. Blood Type Inheritance in Humans

This lesson explains differences among the four blood types in humans: A, B, AB, and O. It also shows how these blood types are passed from parents to children.

Rh Blood Group, Rh Factor & Erythroblastosis Fetalis

9. Rh Blood Group, Rh Factor & Erythroblastosis Fetalis

Rh factor is a red blood cell antigen found in most people. Those with Rh factor are Rh positive, while those without are Rh negative. In this lesson you will learn about Rh blood compatibility and its importance during pregnancy.

Polygenic Inheritance: Definition & Examples

10. Polygenic Inheritance: Definition & Examples

In this lesson you will learn how traits like your height, weight, hair color, and skin pigmentation are determined by the complex interaction of several different genes in a process called polygenic inheritance.

What is DNA Fingerprinting? - Process & Uses

11. What is DNA Fingerprinting? - Process & Uses

DNA fingerprinting is a very useful technique that has applications beyond criminal and forensic analysis. In this lesson, you'll learn what DNA fingerprinting is, how it is done, and different ways it can be used to determine identity.

Pedigree Analysis in Human Genetics: Tutorial

12. 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!

Dihybrid Cross: Definition & Example

13. Dihybrid Cross: Definition & Example

In this lesson, learn what a dihybrid cross is and see an example. Also, find out about phenotypic ratio and how it's the same for each dihybrid cross. After the lesson, test your knowledge with a quiz.

Linked Genes: Definition & Examples

14. Linked Genes: Definition & Examples

Gene linkage is one of those things that can turn even the simplest genetic question into a complex mess. This lesson will teach you what a linked gene is and take you through some solid examples.

What is the Human Genome Project? - Definition, Purpose & Benefits

15. What is the Human Genome Project? - Definition, Purpose & Benefits

We often hear about scientific research being done but may not truly understand what that entails. This is not one of those times. The Human Genome Project has allowed many breakthroughs in genetic research that affect us in a very tangible way, right here, right now.

What is Gene Therapy? - Definition & Uses

16. What is Gene Therapy? - Definition & Uses

Gene therapy may be experimental, but it has the potential to revolutionize medicine. Learn what gene therapy is, how it's currently used, and how it may be used in the future. Then test yourself with a quiz.

Evolution of Genes

17. Evolution of Genes

In this lesson, readers will explore the evidence available from current research about the evolution of genes and their actions. Specifically, this lesson reviews evidence that indicates the presence of ancestral vertebrate gene homologs in lower animal classes.

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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