About This Chapter
OAE - Biology: Speciation & Genetic Variability - Chapter Summary
These lessons help you understand the laws of speciation and how genotypes deviate in order to drive evolution, in preparation for the OAE Biology exam. After studying this guide, you will be prepared to:
- Differentiate between allopatric and sympatric speciations
- Describe how prezygotic and postzygotic barriers propel speciation
- List the attributes of alleles
- Understand how genetic drift measures gene variants
- Measure genetic variability in a population of genotypes
- Discuss the phenomenon of random mutation
Our instructors know how to make learning complex subjects like genetic variability fun and easy. Once you feel like you're able to spot the differences between prezygotic and postzygotic barriers, try out the practice quizzes that accompany each lesson.
OAE - Biology: Speciation & Genetic Variability - Chapter Objectives
Passing the Ohio Assessments for Educators (OAE) is a requirement for potential teachers in the state of Ohio. Instructors must pass the OAEs corresponding to the subjects they plan on teaching. Life science teachers in 7th through 12th grade must pass the OAE Biology exam. In order to pass, test-takers must earn a score of 220. Questions are derived from a set of standards for entry-level teachers determined by the state of Ohio.
The OAE Biology exam consists of five domains, including a domain focused on genetics and evolution. This section includes questions related to speciation and genetic variability and accounts for 27% of the questions. The computer-based exam has a three-hour time limit and consists of 150 questions. All questions are multiple-choice. This chapter gets you comfortable with subject matter that may pop up in the genetics and evolution domain.
1. Speciation: Allopatric and Sympatric Speciation
Discover the definition of a species and learn more about how species split. Find out common terms related to the splitting of species and study what role polyploidy plays in the development of a species.
2. Prezygotic Reproductive Barriers & Speciation: Definition & Examples
We may take for granted why animals choose to mate with other animals of similar appearance, but it's not that simple. There are actually biological barriers to reproduction that can prevent even seemingly closely related species from reproducing. This lesson looks at one such category of hindrances, prezygotic barriers, which make fertilization impossible.
3. Postzygotic Reproductive Barriers: Definition & Examples
Do flying hamsters represent a separate species from your run-of-the-mill hamsters? We'll get to the bottom of this by performing crosses between the two hamster types. You'll explore postzygotic reproductive barriers and their possibly tragic consequences.
4. 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.
5. 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.
6. 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.
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