Copyright

Ch 7: Holt McDougal Biology Chapter 7: Extending Mendelian Genetics

About This Chapter

The Extending Mendelian Genetics chapter of this Holt McDougal Biology Textbook Companion Course helps students learn the essential lessons associated with Mendelian genetics. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Extending Mendelian Genetics textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Biology Extending Mendelian Genetics chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the extending Mendelian genetics topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Chapter Topics

You'll learn all of the biology topics covered in the textbook chapter, including:

  • Recessive, dominant and lethal alleles
  • Sex linked and sex limited traits
  • Codominance and incomplete dominance
  • Definition of polygenetic traits
  • Gene linking and mapping
  • Pedigree analysis
  • Karyotype disorders

Holt McDougal Biology is a registered trademark of Houghton, Mifflin and Harcourt, which is not affiliated with Study.com.

9 Lessons in Chapter 7: Holt McDougal Biology Chapter 7: Extending Mendelian Genetics
Test your knowledge with a 30-question chapter practice test
Lethal Alleles: Definition & Examples

1. Lethal Alleles: Definition & Examples

Some alleles are recessive, some are dominant, and some are just plain bad. In this lesson, we'll learn about how rare lethal alleles can affect the survival of an organism. Specifically, we'll talk about how something like coat color can be lethal in agouti mice.

Exceptions to Independent Assortment: Sex-Linked and Sex-Limited Traits

2. 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?

Exceptions to Simple Dominance: Codominance and Incomplete Dominance

3. 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.

Polygenic Traits: Definition & Examples

4. Polygenic Traits: Definition & Examples

If variety is the spice of life, polygenic inheritance is one genetic mechanism giving us a continuous range of possibilities. In this lesson, learn how a polygenic trait, like height, can be controlled by multiple genes.

Genotype-Environment Interaction and Phenotypic Plasticity

5. Genotype-Environment Interaction and Phenotypic Plasticity

It's not just what's in your genes. In this lesson, we'll begin to explore how some phenotypes are influenced by the interaction between a genotype and the environment. Further, some organisms rely on phenotypic plasticity to change in response to the environmental changes.

Gene Linking & Mapping: Definition & Example

6. Gene Linking & Mapping: Definition & Example

This lesson explains gene linking. Gene linkage was first understood by Thomas Hunt Morgan. His experiments are used as examples to show how gene linkage can be used to understand gene mapping.

Pedigree Analysis in Human Genetics: Inheritance Patterns

7. 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!

Pedigree Analysis in Human Genetics: Tutorial

8. 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!

Karyotype: Definition, Disorders & Analysis

9. Karyotype: Definition, Disorders & Analysis

Some people with chromosomal disorders may have too many or too few chromosomes in their cells. A karyotype analysis can be used to look at the number and appearance of chromosomes in individuals. Keep reading to learn more.

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 200 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

Transferring credit to the school of your choice

Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Other Chapters

Other chapters within the Holt McDougal Biology: Online Textbook Help course

Support