About This Chapter
How it works:
- Identify which concepts are covered on your genetics and heredity homework.
- Find videos on those topics within this chapter.
- Watch fun videos, pausing and reviewing as needed.
- Complete sample problems and get instant feedback.
- Finish your genetics and heredity homework with ease!
Topics from your homework you'll be able to complete:
- Properties of alleles
- Mendel's first law
- Mendel's second law
- Exceptions to simple dominance
- Exceptions to independent assortment
- Chromosomal linkage and crossing over
- Human genetics and 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 Frequency: Definition & Explanation
Allelic frequency is a calculation used in genetics. This lesson will recap some basic genetics and go over allelic frequency. Test your genetics and math skills with the quiz.
12. Genetic Modification: Definition, Advantages & Disadvantages
Genetic modification has allowed scientists to create some pretty neat things, like apples that don't brown and fish that glow. In this lesson, learn what genetic modification is and explore some of its advantages and disadvantages.
13. Incomplete Dominance: Definition & Example
Dominant/recessive inheritance is a common topic in genetics. Incomplete dominance is a naturally occurring phenomenon that may be present during the expression of this type of inheritance. This article describes incomplete dominance and goes over examples found in nature.
14. P Generation: Definition & Offspring
The work of Gregor Mendel left us with important discoveries in the world of genetics. His ideas will be discussed here with reference to the P generation in crosses.
15. Polygenic Inheritance: Definition & Examples
In this lesson you will learn how traits like your height, weight, hair color, and skin pigmentation are determined by the complex interaction of several different genes in a process called polygenic inheritance.
16. Recombination: Definition & Process
Recombination is a nifty little way to mix up your DNA. In this lesson, you will learn about chromosomes, meiosis, and why recombination occurs. Test yourself afterwards with a quiz.
17. What Is Trisomy? - Definition & Symptoms
When a diploid organism has an extra copy of one of its chromosomes, it's called trisomy. In this lesson, find out what causes trisomy and its symptoms in humans.
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