About This Chapter
TExES Science 7-12: Basic Genetics - Chapter Summary
These lesson videos feature lectures by our professional instructors about the genetic inheritance of traits, human genetics and genetic mutations. Use these lessons to prepare for related questions on the Texas Examinations of Educator Standards (TExES) Science 7-12 exam regarding:
- The properties of alleles and chromosomes
- Mendel's first and second law of genetic inheritance
- Simple dominance, codominance and incomplete dominance
- Independent assortment, sex linked and sex limited traits
- Model organisms and human genetic research methods
- Penetrance and phenotypic variability of genetic disorders
- Types, processes and effects of point mutations
- Mutagens and environmental effects on mutation rate
For an additional review of these lessons, read the lesson transcripts. These written overviews of the lessons will help you reinforce your retention of the material presented in the lessons videos and study the key vocabulary of the chapter. After you've completed your review of the material in a lesson, take the lesson's quiz to identify topics you don't understand. Then improve your understanding of these topics by returning to the lessons with the video tags.
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: 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. 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. 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.
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. 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.
8. 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!
9. Human Genetics Research Methods: Pedigrees and Population Genetics
Have you ever wondered how people study human genetics? Do you know what a pedigree or a complex disease is? In this lesson you'll learn about some of the techniques that human geneticists use and what pedigrees and complex diseases have to do with human genetics.
10. Genetic Disorders: Penetrance & Phenotypic Variability
Did you know that sometimes a dominant human genetic condition will skip a generation in a family? It does happen, and some dominant genetic conditions will also have a wide range of phenotypes, sometimes even within the same family. Learn more in this lesson about phenotypic variability!
11. Point Mutations: Types, Processes & Effects
You might not think about your DNA that often, but you would probably notice if something was mutated on your DNA! This lesson will discuss what happens when your DNA gets mutated, focusing specifically on point mutations and their impacts.
12. Mutagens: How the Environment Affects Mutation Rates
What causes mutations to occur in living things? How do we avoid mutations? Are mutations always bad? Discover answers to these questions and more in this lesson on mutagens.
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Other chapters within the TExES Science 7-12 (236): Practice & Study Guide course
- About the TExES Science 7-12 Exam
- TExES Science 7-12: Scientific Inquiry & Processes
- TExES Science 7-12: Motion
- TExES Science 7-12: Fluid Mechanics
- TExES Science 7-12: Newton's Laws
- TExES Science 7-12: Oscillations
- TExES Science 7-12: Laws of Gravitation
- TExES Science 7-12: Electrical Forces & Fields
- TExES Science 7-12: Electricity & Magnetism
- TExES Science 7-12: Potential & Capacitance
- TExES Science 7-12: Work, Energy & Power
- TExES Science 7-12: Linear & Angular Momentum
- TExES Science 7-12: Thermodynamics
- TExES Science 7-12: Optics & Waves
- TExES Science 7-12: Quantum Physics
- TExES Science 7-12: Matter & Atomic Structure
- TExES Science 7-12: Periodicity
- TExES Science 7-12: Properties of Gases
- TExES Science 7-12: Chemical Bonding
- TExES Science 7-12: Chemical Equations & Stoichiometry
- TExES Science 7-12: Equilibrium
- TExES Science 7-12: Properties of Solutions
- TExES Science 7-12: Energy Transformations
- TExES Science 7-12: Radioactivity
- TExES Science 7-12: Oxidation-Reduction Reactions
- TExES Science 7-12: Acid-Base Chemistry
- TExES Science 7-12: Organic Compounds
- TExES Science 7-12: Cell Biology
- TExES Science 7-12: Prokaryotic & Eukaryotic Cells
- TExES Science 7-12: Protists, Fungi & Viruses
- TExES Science 7-12: Plant Cells
- TExES Science 7-12: Nucleic Acids & Enzymes
- TExES Science 7-12: Transcription & Translation
- TExES Science 7-12: Cell Reproduction & Division
- TExES Science 7-12: Metabolic Biochemistry
- TExES Science 7-12: DNA Replication
- TExES Science 7-12: Theory of Biological Evolution
- TExES Science 7-12: Evolutionary Change on Earth
- TExES Science 7-12: Taxonomic Systems
- TExES Science 7-12: Plant Biology
- TExES Science 7-12: Plant Reproduction & Growth
- TExES Science 7-12: Animal Biology
- TExES Science 7-12: Human Organ Systems
- TExES Science 7-12: Human Reproduction & Development
- TExES Science 7-12: Homeostasis of Organisms
- TExES Science 7-12: Biology & Behavior
- TExES Science 7-12: Ecosystems & Ecological Cycles
- TExES Science 7-12: Earth's Spheres & Internal Structure
- TExES Science 7-12: Minerals & Rocks
- TExES Science 7-12: Earth's Changing Surfaces
- TExES Science 7-12: Geologic Time
- TExES Science 7-12: The Hydrosphere
- TExES Science 7-12: Solar System & the Universe
- TExES Science 7-12: The Atmosphere
- TExES Science 7-12: Weather & Storms
- TExES Science 7-12: Learning & Instruction