About This Chapter
Genetics & Inheritance - Chapter Summary
In this chapter, subjects relating to genetics and inheritance are covered thoroughly. Watch comprehensive video lessons on heredity, traits and chromosomes and the properties of alleles, plus sex determination, Barr bodies and x-inactivation. Once you complete this chapter, you should be ready to:
- Outline the process of crossing over and gene linkage
- Detail Mendel's first law and its applications
- Discuss Mendel's second law, the law of independent assortment
- Examine Mendel's dihybrid cross example
- Identify the exceptions to independent assortment
- Provide examples of monohybrid crosses
- Highlight codominance and genes with multiple alleles
These subjects are easy to understand with help from this informative and expertly written chapter. In ten minutes or less, our video lessons clearly present these subjects and are navigable by using the video tabs feature. This can be beneficial if you need to go back and review any of the material again. Take the short quiz provided with each lesson or the test at the end of the chapter in order to assess your readiness to take an exam or move forward.
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. Sex Determination, X-Inactivation, and Barr Bodies
Sex determination, X-inactivation and Barr bodies are complex chromosomal processes. Learn more about each of these processes and test your knowledge with a quiz.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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!
9. 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?
10. Monohybrid Cross: Definition & Example
Some genetic characteristics are inherited in predictable patterns. In this lesson you will learn what monohybrids are and how to predict the kinds of characteristics that their offspring will show.
11. Codominance & Genes with Multiple Alleles
Some genes have more than two alleles, which increases the possible genetic outcomes for offspring. And as we'll see in this lesson, sometimes those alleles work together to produce a codominant phenotype.
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