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- List the properties of alleles.
- Understand Mendel's first and second laws and discuss their applications.
- Discuss the exceptions to simple dominance, such as codominance and incomplete dominance.
- Learn about the exceptions to independent assortment, such as sex-linked and sex-limited traits.
- Explain how chromosomal linkage and crossing over can affect inheritance.
- Describe how model organisms can be used to understand 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: 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. Genetic Structure of Human Populations: Definition & Concept
Human beings are extremely diverse in appearance and susceptibility to diseases such as cancer, diabetes and obesity -- yet our genomes our 99.9% identical. How are we so different if our genome says we are nearly all the same? Read on to learn more.
12. Pleiotropy: Definition & Examples
There are many different mutations that occur during growth in organisms. Many times, these mutations can be passed on and will occur in such a way as to be beneficial to the organism. Sometimes, they are not. We will be looking at one such type of mutation here.
13. Quantitative Trait: Definition & Concept
What determines how tall a person will be? Is it the genes a person carries or is it the environment that determines how tall a person may grow? We will answer these questions as we explore quantitative traits.
14. Recessive Trait: Definition & Example
Can you bend your thumb backwards like a hitch-hiker? Do you have small, attached earlobes? Are your eyes blue? If you answered yes to any one of these, then you have a recessive trait. Learn what recessive traits are in this lesson.
15. Allele Frequency: Definition, Calculation & Example
This lesson will discuss what an allele is and how its frequency is calculated in a population. The Hardy-Weinberg principle will also be explained mathematically in this lesson with practical examples.
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