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Ch 48: Genetic Variability & Mutation for the MCAT: Help and Review

About This Chapter

The genetic variability and mutation chapter of this MCAT Help and Review course is the simplest way to master genetics. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of genetic variability and mutation.

Who's it for?

Anyone who needs help learning or mastering MCAT material will benefit from taking this course. You will be able to grasp the subject matter faster, retain critical knowledge longer and earn higher scores. You're in the right place if you:

  • Have fallen behind in understanding the effects of mutations on DNA and protein function
  • Need an efficient way to learn about genetic variability and mutation
  • Learn best with engaging auditory and visual tools
  • Struggle with learning disabilities or learning differences, including autism and ADHD
  • Experience difficulty understanding your teachers
  • Missed class time and need to catch up
  • Can't access extra MCAT review resources at school

How it works:

  • Start at the beginning, or identify the topics that you need help with.
  • Watch and learn from fun videos, reviewing as needed.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Submit questions to one of our instructors for personalized support if you need extra help.
  • Verify you're ready by completing the genetic variability and mutation chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the genetic variability and mutation chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any genetic variability and mutation question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

In this chapter, you'll learn the answer to questions including:

  • What are the differences between mitosis and meiosis?
  • What is the chromosome theory of inheritance?
  • How does the environment affect mutation rates?
  • What are the effects of frameshift mutations?
  • What are missense, nonsense and silent mutations?
  • What are some genetic risk factors for cancer?
  • How can chromosomal rearrangements occur?
  • Can random mutation be beneficial?
  • What are some inborn errors of metabolism?

14 Lessons in Chapter 48: Genetic Variability & Mutation for the MCAT: Help and Review
Test your knowledge with a 30-question chapter practice test
The Chromosome Theory of Inheritance: Segregation and Independent Assortment

1. The Chromosome Theory of Inheritance: Segregation and Independent Assortment

Mendel proposed the law of segregation and the law of independent assortment to explain the inheritance behind his pea plant traits. A hundred years later, Boveri and Sutton developed the chromosome theory of inheritance, which stated that chromosomes were responsible for the heredity Mendel observed. Learn about these men and their ideas in this lesson.

Sex Determination, X-Inactivation, and Barr Bodies

2. 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.

Mutagens: How the Environment Affects Mutation Rates

3. Mutagens: How the Environment Affects Mutation Rates

What causes mutations to occur in living things? How do we avoid mutations? Are mutations always bad? Discover answers to these questions and more in this lesson on mutagens.

Effects of Frameshift Mutations: Definitions and Examples

4. Effects of Frameshift Mutations: Definitions and Examples

What is a frameshift in genetic translation? How can a frameshift mutation change a protein? In this lesson, learn about the codon reading frame and how frameshift mutations cause serious problems for polypeptide formation.

Effects of Mutations on Protein Function: Missense, Nonsense, and Silent Mutations

5. Effects of Mutations on Protein Function: Missense, Nonsense, and Silent Mutations

How does a tiny point mutation change the way a protein works? What are the consequences of base substitutions? In this lesson, we'll use an imaginary creature to explore missense, nonsense and silent mutations.

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

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

What are genetic mutations? How do they affect our DNA? This lesson covers the basics of point mutations and provides simple examples of different mutation types.

Cancer Syndromes & Genetic Risk Factors for Cancer

7. Cancer Syndromes & Genetic Risk Factors for Cancer

This lesson describes something called cancer syndrome or family cancer syndrome, as well as the important clues that can help it be detected and two examples of such a condition.

Genetic Variability and Random Mutation

8. Genetic Variability and Random Mutation

Evolution is driven by variation among populations. The amount of variability determines how well a population can adapt to environmental changes, while random mutations can provide new variations that help a population adapt to unexpected changes.

How Meiosis & Fertilization Promote Genetic Variation

9. How Meiosis & Fertilization Promote Genetic Variation

Individuals are different because of their genetic variation. Even two siblings who come from the same parents have different genetic make-ups. This variation comes from both meiosis and fertilization, which are components of sexual reproduction.

Cytoplasmic & Mitochondrial Inheritance: Types & Impacts

10. Cytoplasmic & Mitochondrial Inheritance: Types & Impacts

Everyone knows that you inherit genetic information from your parents, but did you know there are multiple ways for this to occur? In this lesson, we'll look at extranuclear inheritance and see what this means for passing on DNA.

Chromosomal Rearrangement

11. Chromosomal Rearrangement

Have you ever switched out one thing for another or traded places with someone? Our chromosomes can do this, too. This lesson tells you how as we go over chromosomal rearrangements!

What Are Inborn Errors of Metabolism?

12. What Are Inborn Errors of Metabolism?

Inborn errors of metabolism are genetic disorders that affect the metabolism of food components. Many of these disorders are difficult to diagnose but must be caught early in order to be treated. Learn about a common disorder, phenylketonuria.

Genetic Drift: Definition, Examples & Types

13. Genetic Drift: Definition, Examples & Types

Genetic drift reduces genetic variability of a population by decreasing the size of the population. The change in population size and variability often leads to new species and unique populations.

Synapsis & Crossing Over in Meiosis

14. Synapsis & Crossing Over in Meiosis

This lesson will cover synapsis and crossing over that occur during the process of meiosis. We'll look at exactly when these occur and how they can lead to greater genetic diversity.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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Other Chapters

Other chapters within the MCAT Prep: Help and Review course

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