About This Chapter
Patterns of Genetic Inheritance - Chapter Summary
You'll find short, easily navigable video lessons in this chapter on patterns of genetic inheritance. Each lesson covers a different genetics topic, from the properties of alleles to Mendel's dihybrid cross. Work at your own pace and complete as many or as few of the lessons as you need. To help you identify any areas where you may need to study further, we've included self-assessment quizzes along with each lesson and a comprehensive test at the end. Use this chapter to learn how to:
- Detail heredity, chromosomes and traits
- Identify the properties of alleles
- Discuss Mendel's first and second laws
- Describe the ratio associated with Mendel's dihybrid cross
- Explain the exceptions to simple dominance and independent assortment
- Define crossing over and gene linkage
- Outline the multifactorial traits and model organisms of human genetics
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.
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.
3. Mendel's First Law & Its Application
Genetics is a fascinating and confusing world. This lesson will delve into Gregor Mendel's First Law, or the Law of Segregation, explaining what it means and how you can use it.
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.
5. 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!
6. 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.
7. 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?
8. 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.
9. 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!
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Other chapters within the Biology 203: Cell & Molecular Biology course
- Biological Molecules
- Cell Structure & Function Overview
- Cell Membrane & Transport Overview
- Principles of Cell Metabolism
- Photosynthesis Fundamentals
- Cellular Respiration & Fermentation
- Cell Cycles
- DNA Structure & Replication
- Mutation & DNA Damage
- The Central Dogma of Biology & Protein Synthesis
- Structure & Function of Viruses
- Control of Gene Expression
- Genetic Manipulation Overview