About This Chapter
Who's it for?
Anyone who needs help learning or mastering high school biology material will benefit from taking this course. There is no faster or easier way to learn biology. Among those who would benefit are:
- Students who have fallen behind in understanding Mendel's laws, genetics and heredity
- Students who struggle with learning disabilities or learning differences, including autism and ADHD
- Students who prefer multiple ways of learning science (visual or auditory)
- Students who have missed class time and need to catch up
- Students who need an efficient way to learn about genetics and heredity
- Students who struggle to understand their teachers
- Students who attend schools without extra science learning resources
How it works:
- Find videos in our course that cover what you need to learn or review.
- Press play and watch the video lesson.
- Refer to the video transcripts to reinforce your learning.
- Test your understanding of each lesson with short quizzes.
- Verify you're ready by completing the genetics and heredity chapter exam.
Why it works:
- Study Efficiently: Skip what you know, review what you don't.
- Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
- Be Ready on Test Day: Use the genetics and heredity chapter exam to be prepared.
- Get Extra Support: Ask our subject-matter experts any genetics and heredity question. They're here to help!
- Study With Flexibility: Watch videos on any web-ready device.
Students will review:
This chapter helps students review the concepts in a genetics and heredity unit of a standard high school biology course. Topics covered include:
- Mendel's Law of Segregation
- Mendel's Law of Independent Assortment
- Codominance and incomplete dominance
- Chromosomal linkage and crossing over
- Sex-linked and sex-limited traits
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. 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. 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.
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!
11. What is Color Blindness? - Causes & Overview
Humans have an incredibly sensitive and sophisticated visual system. Color blindness is a visual disorder characterized by a deficiency in color detection or processing. Here we explore several types of color blindness and their causes.
12. C. Elegans in Development
Much of what we know about embryonic development comes from research on a microscopic worm called C. elegans. Learn why these tiny worms make such great research tools, and why what we learn from them teaches us about human development too!
13. Gametic Isolation: Definition & Example
Have you ever wondered why two separate species cannot mate and produce offspring? This lesson will examine the prezygotic barrier called gametic isolation and explain why interspecies cannot mate. It will also give some examples of organisms that experience gametic isolation.
14. Genetic Manipulation: Definition, Pros & Cons
In this lesson, we'll be looking at genetic manipulation, which is essentially the manipulation of gene sequences in living organisms to alter specific traits. We'll also look at how it works and the controversies surrounding it, and then you'll test your knowledge with a quiz!
15. Homozygous Recessive: Definition & Disorders
Many disorders are homozygous recessive, from cystic fibrosis to albinism. Learn how a person (or a rat) can end up with two recessive genes and why this can cause genetic disorders.
16. Independent Assortment: Definition, Principle & Example
In this lesson, we will define the process of independent assortment, examine the principle, and go through some examples. At the end, you can test your knowledge with a short quiz.
17. Phenotypic Ratio: Definition & Overview
This lesson addresses the concept of phenotypic ratio. It includes definitions, examples, and illustrations. A brief quiz accompanies the lesson and highlights its major points.
18. Translocation: Definition & Types
Genes can become mixed up and change between one set of chromosomes to another in a process called translocation. Learn more about types of translocation and their effects on an organism.
19. What Are Genes? - Definition, Types & Function
It's in the genes. Height, sense of humor, or athletic skill are all traits we've heard as being in the genes. But what are genes really, and how do they influence who we are, what we look like, and how we function?
20. What is Polygenic Dominance?
When multiple genes interact in order to create a trait, it is called a polygenic trait. This lesson will be about a specific type of interaction called polygenic dominance, which we will examine through the example of eye color.
21. Is Degenerative Disease Hereditary?
This lesson is going to discuss what a degenerative disease is and give examples of different degenerative diseases. We will also discuss whether they are hereditary or caused by other factors.
22. Epistasis Examples in Humans
Epistasis occurs when one gene affects the outcome, or phenotype, of another gene. We'll look at three examples in this lesson: hair color, albinism, and Alzheimer's disease.
23. Types of Epistasis
In this lesson, we will explore what the term epistasis means as well as what role it plays in our phenotypic expression of traits. We will discuss several different types of epistasis.
24. What Is the F2 Generation? - Definition & Characteristics
In this lesson, we'll explore what an F2 generation is, how one arrives at this particular generation, and what the expected characteristics and distributions are among individuals.
25. Dominant vs Recessive Epistasis: Example & Analysis
This lesson will compare dominant and recessive epistasis and provide examples of each. It will also explain why dominant epistasis affects more individuals than recessive epistasis does.
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