Ch 12: Holt McDougal Modern Biology Chapter 12: Inheritance Patterns and Human Genetics

About This Chapter

The Inheritance Patterns and Human Genetics chapter of this Holt McDougal Modern Biology textbook companion course helps students learn essential modern biology lessons on inheritance patterns and human genetics. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Inheritance Patterns and Human Genetics textbook chapter.

How it works:

  • Identify the lessons in the Holt McDougal Modern Biology Inheritance Patterns and Human Genetics chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the inheritance patterns and human genetics topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • The genome
  • Exceptions to independent assortment
  • Chromosomal linkage and crossing over
  • How DNA is affected by mutations, insertions and deletions
  • Effects of frameshift mutations
  • Aneuploidy and nondisjunction
  • Lethal alleles
  • Research methods in human genetics
  • Pedigree analysis in human genetics
  • Genetic abnormalities in human growth and development
  • Polygenic traits
  • Genetic birth defects

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12 Lessons in Chapter 12: Holt McDougal Modern Biology Chapter 12: Inheritance Patterns and Human Genetics
Test your knowledge with a 30-question chapter practice test
Basic Genetics: The Genome & Chromosomes

1. Basic Genetics: The Genome & Chromosomes

A person's eye color, height, hair color, etc. are all attributes of one's genetics. Learn about basic genetics, including genomes, chromosomes, homologous chromosomes, gametes, and diploid complements.

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

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

Sex chromosomes are the chromosomes which determine the sex of an organism. Learn more about the exceptions to independent assortments, sex- linked and sex-limited traits as well as carriers of disadvantageous genes.

Crossing Over & Gene Linkage: Definition, Importance & Results

3. Crossing Over & Gene Linkage: Definition, Importance & Results

While linked genes are supposed to be inherited together, a crossover event can alter the linkage of alleles on homologous chromosomes. Learn more about crossing over and gene linkage, it's definitions, importance and results.

What is a Point Mutation? - Definition, Causes & Types

4. What is a Point Mutation? - Definition, Causes & Types

Point mutations are changes to the genetic sequence where a single nucleotide base is changed, inserted, or deleted. Explore the definition and causes of point mutations and discover the difference between the two basic types: base substitutions and insertion and deletion.

Effects of Frameshift Mutations: Definitions and Examples

5. Effects of Frameshift Mutations: Definitions and Examples

Frameshift mutations happen when a protein is drastically changed because of an insertion or a deletion. Review the different types of mutations, the codon reading frame, and how damaging frameshift mutations really are.

Nondisjunction & Aneuploidy: Definition & Examples

6. Nondisjunction & Aneuploidy: Definition & Examples

Nondisjunction and aneuploidy within the study of chromosomes are important concepts needed in order to build knowledge and understanding adequately about biology. Learn more about their definitions and read examples.

Lethal Alleles: Definition & Examples

7. Lethal Alleles: Definition & Examples

In humans and other organisms, each gene has two alleles, one from each parent. Explore the definition and examples of lethal alleles to understand that they can be dominant or recessive and may cause disease. Learn about agouti mice, recognize the ways many animals are affected by agouti genes, and review how these genes and lethal alleles are related.

Human Genetics Research Methods: Pedigrees and Population Genetics

8. Human Genetics Research Methods: Pedigrees and Population Genetics

Human genetics research involves the analysis of pedigrees, or charts of family histories that show the phenotypes and family relationships of individuals. Discover why humans are considered poor model organisms for the study of genetics. Learn about autosomal and sex-linked conditions, multifactorial traits, complex diseases, and human population genetics.

Pedigree Analysis in Human Genetics: Inheritance Patterns

9. Pedigree Analysis in Human Genetics: Inheritance Patterns

Pedigree analysis can be an important process to find information in human genetics, including inheritance patterns. Review pedigrees, and learn about autosomal dominant, as well as autosomal recessive, inheritance patterns. Explore sex-linked inheritance patterns, both dominate and recessive.

Genetic Abnormalities in Human Growth and Development

10. Genetic Abnormalities in Human Growth and Development

Genetic abnormalities are caused by inherited genes containing defective genes, or chromosomal abnormalities. Learn abnormalities in human development, how genetic disorders occur, and examples of some common genetic disorders.

Polygenic Traits: Definition & Examples

11. Polygenic Traits: Definition & Examples

A polygenic trait refers to a trait such as height that is controlled by two or more genes. Explore the definition and examples of polygenic traits and discover the Nilsson-Ehle wheat experiment and polygenic inheritance in humans.

Genetic Birth Defects: Risk Factors, Epidemiology, and Testing

12. Genetic Birth Defects: Risk Factors, Epidemiology, and Testing

Birth defects can be caused by genetics and may pose several risk factors for a newborn. Learn about birth defects, different examples of birth defects, risk factors, epidemiology associated with these defects, and how to test for defects.

Chapter Practice Exam
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Practice Final Exam
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