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Ch 20: Genetics

About This Chapter

Watch genetic video lessons and learn about chromosomes, genotypes and more. Spend a few minutes taking quizzes to check your knowledge of key genetics concepts.

It is through genetics that simple things like your eye color or hair color are determined, but genetics may also determine if you are predisposed to getting certain types of cancer or if you will suffer from a developmental disorder. These lessons on genetics will talk about the genome, structure of chromosomes and give you an overview of genetics. These lessons will also cover:

  • Mendel's law of segregation and law of independent assortment
  • Properties of alleles
  • An introduction to codominance and incomplete dominance
  • A discussion of sex-linked and sex-limited traits
  • Chromosomal linkage and crossing over
  • Human genetics and model organisms

VideoObjectives
The Genome Study concepts, such as chromosomes, haploids, diploids, gametes and homologs, to learn more about the genome.
The Structure of Chromosomes Explore the structure of chromosomes, and learn about topics like histones, chromatin, nucleosome, gene and karyotype.
Overview of Genetics Examine genetics through learning about topics such as character, trait, heritable, genotype, phenotype, gene and allele.
Mendel's First Law: The Law of Segregation Touch on topics that include gamete, allele, gene, genotype and phenotype while studying this law.
Properties of Alleles Learn more about alleles, including discussions on genotypes, phenotypes, locus, homozygous, heterozygous, dominant and recessive.
Application of Mendel's First Law See how this theory actually plays out through examples and discussions.
Mendel's Second Law: The Law of Independent Assortment Explore this second idea from Mendel.
Application of Mendel's Second Law Discover concepts related to Mendel's second law, such as Punnett Square and second filial generation.
Exceptions to Simple Dominance: Codominance and Incomplete Dominance Examine the ideas of codominance and incomplete dominance.
Chromosomal Linkage and Crossing Over Analyze the ideas of chromosomal linkage and crossing over.
Human Genetics and Model Organisms Study ideas related to human genetics, such as polygenic traits, quantitative, qualitative, height and skin color.

10 Lessons in Chapter 20: Genetics
Genetics: Heredity, Traits & Chromosomes

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.

Properties of Alleles

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.

Mendel's First Law: The Law of Segregation

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.

Application of Mendel's First Law

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.

Mendel's Second Law: The Law of Independent Assortment

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.

Mendel's Dihybrid Cross Example: Practice & Ratio

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!

Exceptions to Simple Dominance: Codominance and Incomplete Dominance

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.

Exceptions to Independent Assortment: Sex Linked and Sex Limited Traits

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?

Crossing Over & Gene Linkage: Definition, Importance & Results

9. 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.

Human Genetics: Multifactorial Traits & Model Organisms

10. 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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