Ch 12: PSSA - Science Grade 8: Genetics & Inherited Traits

About This Chapter

This chapter has been designed to help students brush up on their knowledge of genetics and inherited traits as they study for the PSSA Science Grade 8 exam.

PSSA - Science Grade 8: Genetics & Inherited Traits - Chapter Summary

The lessons in this chapter aid students in studying for the PSSA - Science Grade 8 exam by reviewing important information about genetics and heredity. Students will refresh their understanding of the properties of genes and how genes are passed from one generation to the next. This chapter covers:

  • Characteristics of alleles
  • Definition and application of Mendel's Law of Segregation and Law of Independent Assortment
  • Codominance and incomplete dominance
  • Sex linked and sex limited traits
  • Polygenic traits

Since we strive to keep the educational experience efficient and enjoyable, students will find several methods for learning. Each lesson contains an engaging video that helps visually depict the material being reviewed. Video transcripts are included as a great resource for taking notes. Students can take a self-assessment quiz after each lesson to gauge their knowledge of the topics. To return to particular section of the lesson, the timeline below the video can be used for easy navigation.

9 Lessons in Chapter 12: PSSA - Science Grade 8: Genetics & Inherited Traits
Test your knowledge with a 30-question chapter practice test
Genetics: Heredity, Traits & Chromosomes

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.

Properties of Alleles

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.

Mendel's First Law: The Law of Segregation

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.

Application of Mendel's First Law

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.

Mendel's Second Law: The Law of Independent Assortment

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.

Mendel's Dihybrid Cross Example: Practice & Ratio

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!

Exceptions to Simple Dominance: Codominance and Incomplete Dominance

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.

Exceptions to Independent Assortment: Sex-Linked and Sex-Limited Traits

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?

Polygenic Traits: Definition & Examples

9. Polygenic Traits: Definition & Examples

If variety is the spice of life, polygenic inheritance is one genetic mechanism giving us a continuous range of possibilities. In this lesson, learn how a polygenic trait, like height, can be controlled by multiple genes.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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