About This Chapter
Chromosomal Structure & Inheritance - Chapter Summary
These lessons present DNA, its functions, structure and location. During your study, you learn about the crossing over of genes and how this leads to great diversity. Additional lesson topics explain the theories and genetic contributions of scientist Thomas Hunt Morgan and why inheritance patterns for traits like colorblindness can be complex.
Traits aren't only inherited, and a lesson on the gene-environment interaction shows you how environment and behavior can be influenced by genes. Once you read through all these lessons, you will be ready to do the following:
- Describe the structure of chromosomes
- Detail the scientific discoveries and theories of Mendel, Boveri and Sutton
- Explain the role of gametes in reproduction
- Differentiate between codominance and incomplete dominance
- Outline how multiple alleles and codominant phenotypes are related
Read through the text lessons and watch the videos as many times as you need to in order to master these topics. Chapter tests make excellent test prep resources so you can see how you might score on an upcoming exam. Help from a professional instructor is just a click away if you need it. Access the chapter any time you'd like to study on any mobile phone, tablet or computer.
1. What is DNA?
In this lesson, we will learn what DNA is, what its characteristics and functions are, even where it is located and what information it contains. We'll also learn how the double helix is created. Find out more.
2. How is DNA Organized into Chromosomes? - Structure & Function
Explore the structure of chromosomes and see how DNA fits inside the nucleus of the cell. In this lesson, you'll learn about histones, chromatin and nucleosomes.
3. The Chromosome Theory of Inheritance: Segregation and Independent Assortment
Mendel proposed the law of segregation and the law of independent assortment to explain the inheritance behind his pea plant traits. A hundred years later, Boveri and Sutton developed the chromosome theory of inheritance, which stated that chromosomes were responsible for the heredity Mendel observed. Learn about these men and their ideas in this lesson.
4. Genetic Crossing Over: Definition & Concept
Crossing over of genes is a big factor in the genetic diversity of living things. Here we will define the process of crossing over, and further explore the mechanism behind it.
5. Gametes: Definition, Formation & Fusion
Gametes are the cells that fuse together during sexual reproduction to form a new organism. This lesson covers what these cells are, what they do, and the end result of when they meet.
6. 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?
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. Thomas Hunt Morgan Biography
Without the countless efforts by scientists over the years, we would know little to nothing about our world. Thomas Hunt Morgan's experiments with genes, chromosomes, and inheritance gave further proof of how we get the features that we get.
9. 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.
10. Gene-Environment Interaction
The following lesson explores how genes and a person's environment influence behavior and outward expression of traits. A short quiz will follow the lesson to check your understanding of this timely topic.
11. How Meiosis & Fertilization Promote Genetic Variation
Individuals are different because of their genetic variation. Even two siblings who come from the same parents have different genetic make-ups. This variation comes from both meiosis and fertilization, which are components of sexual reproduction.
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Other chapters within the HSC Biology: Exam Prep & Syllabus course
- Scientific Investigations Overview
- Scientific Validity
- Data Collection & Analysis in Science
- Scientific Presentations
- Internal & External Environments
- Gas & Nutrient Transport in Animals & Plants
- Regulation in Animals & Plants
- Mendel & Gene Expression
- Mechanisms of Genetic Change
- DNA Replication & Protein Synthesis
- Recombinant DNA Technology
- Biotechnology Basics
- Genetic Engineering & Reproductive Technologies
- Classification Hierarchy
- Health & Disease
- Immune Response
- Nervous System & Sensory Mechanisms
- Anatomy & Disorders of the Eye
- Sound & Hearing
- Evolutionary Change
- Time & Human Evolution
- History of Botany
- Photosynthesis Basics
- HSC Biology Flashcards