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- Describe the properties of alleles.
- Discuss the applications of Mendel's first and second laws.
- Learn the exceptions to simple dominance and independent assortment.
- Explain how human genetics can be represented by model organisms.
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. Allelic Variation: Definition & Explanation
This lesson provides an overview of allelic variation, complete with real-world examples, definitions, and explanations. When you have finished reading the lesson and taking the accompanying quiz, you should be able to tell the difference between a gene and a trait, or explain why some alleles are dominant or recessive.
12. Genetic Selection: Definition, Pros & Cons
When it comes to the genetic traits of a population, 'selection' is the process that chooses those traits. Artificial genetic selection is controversial, especially when it comes to human beings. This lesson defines genetic selection and discusses the pros and cons of artificial genetic selection.
13. Heterozygote Advantage: Example, Overview
If two copies of a harmful allele are bad, why would a single copy be good for you? It's true - heterozygotes can have an advantage. Discover how some genetic diseases survive by giving their carriers an edge over everybody else.
14. Monosomy: Definition, Examples & Disorders
When a diploid organism is missing a copy of one of its chromosomes, it's called monosomy. In this lesson, discover the way in which monosomy occurs some of the disorders it causes in humans.
15. Nature vs. Nurture Debate: History & Examples
In this lesson, we'll discuss how the nature versus nurture debate changed throughout the 19th and 20th century. We'll then discuss examples of change affected by nature or nurture, such as phenotypic plasticity and epigenetics.
16. What is a Trait? - Definition, Types & Examples
This lesson introduces the concept of traits. In this lesson, learn about dominant and recessive traits, alleles and why some mice are white and others black. A quick summary and brief quiz follow the lesson.
17. Phylogenetics: Definition & Analysis
Discussions on the diversity of life often rely on a large diagram known as the Tree of Life. This kind of diagram shows the evolutionary path taken by organisms. How these organisms are classified into such a diagram is the field of phylogenetics.
18. Allelopathy: Definition & Examples
Have you ever heard of allelopathy? Most people have not, but it is a very powerful and helpful process that helps plants survive. In this lesson you will learn about allelopathy and be introduced to some allelopathic plants.
19. What is Anagenesis? - Definition & Example
This lesson reviews anagenesis, which is a mechanism of biological evolution. We'll also discuss the main alternatives to anagenesis, punctuated equilibrium.
20. Gamete Intrafallopian Transfer (GIFT): Definition & Procedure
We will look at one of the newer options for fertility treatments known as GIFT. You will gain an understanding of what it is and how it is performed.
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