About This Chapter
Genetic Inheritance & Pedigrees - Chapter Summary
Studying these lessons will help you improve your understanding of genetic inheritance and pedigrees. Topics like pedigree analysis in human genetics and the influence of sex-linked and polygenic inheritance on human development are covered in this chapter. After reviewing the lessons, you should be ready to do the following:
- Discuss the influence single gene-pair inheritance has on human development
- Describe the effect chromosome segregation has on genetics
- Explain what it means to be a universal donor
- Discuss how genetics explain a complex inheritance pattern
- Use probability to solve complex genetics problems
- Recognize exceptions to Mendel's law of independent assortment
- Analyze a pedigree to determine the kind of inheritance pattern a genetic condition follows
- Discuss ethical implications of genetic testing
The lessons found in this chapter will help you better understand concepts related to genetic inheritance and pedigrees. Major vocabulary words are highlighted in bold to emphasize important topics. A brief quiz is available to test your knowledge after each lesson, and the quizzes can be printed.
1. The Influence of Single Gene-Pair Inheritance on Development
What is single gene-pair inheritance? What influence does it have on human development? Learn the answers to these questions as we explore this area of genetic inheritance in this video lesson.
2. The Influence of Sex-Linked and Polygenic Inheritance on Development
What is sex-linked inheritance? What influence does it have on human development? What does it mean if a trait is polygenic? Learn the answers to these questions as this lesson explores this area of genetic inheritance.
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.
4. Application of Mendel's First Law
Hollywood Squares? No, it's Punnett Squares! Those wacky diagrams are a geneticist's best friend. See how they turn geneticists into soothsayers, predicting the genotypic and phenotypic future.
5. 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.
6. Mendel's Dihybrid Cross Example: Practice & Ratio
Oh no! Twice the genes and sixteen genotypes - a dihybrid cross seems overwhelming to understand. Never fear though, Punnett squares will save the day!
7. 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.
8. 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?
9. Using Probability to Solve Complex Genetics Problems
In this lesson, you're going to learn how to use Punnett squares and the multiplication rule to quickly solve complex genetic problems with respect to the law of independent assortment.
10. 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.
11. 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.
12. 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.
13. 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!
14. 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!
15. Genetic Testing & Screening: Social & Ethical Considerations
In this lesson, we'll explore the big issue of genetic testing and screening. Let's take a look how it can change a person's life and affect the lives of those close to them.
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