About This Chapter
Population Evolution - Chapter Summary
Populations of most species evolve over time to adapt to environmental and biological changes. Discover what genetic and ecological factors initiate evolutionary changes among species populations in these brief but engaging lessons. This chapter also explores how to use the Hardy Weinberg Equilibrium equation to determine if a species population is or is not in equilibrium and/or changing. Additionally, you can use this chapter to further investigate:
- Microevolution causes such as natural selection, gene flow and genetic drift
- The necessity of gene pool diversity for a species' survival
- Biological influences on mating selection and male competition
- Benefits of adaptation when organisms are faced with environmental changes
Once you've thoroughly reviewed the concepts featured in this chapter, utilize the lesson quizzes and chapter exam to assess your comprehension of the material. Each quiz contains embedded links that take you directly to specific topics within the lesson so you can quickly and easily review only the information you need to. You can also print the quiz worksheets and full transcripts for any of the video lessons for hard-copy study material. Expert instructors are also available to answer any questions you may have on the material.
1. Causes of Microevolution: Natural Selection, Gene Flow & Genetic Drift
Environments are dynamic, which causes populations to be as well. In this lesson, you'll learn about microevolution, as well as the mechanisms behind it that cause changes in allele frequencies within populations.
2. Hardy-Weinberg Equilibrium I: Overview
In this lesson, we'll examine population genetics in greater detail. We'll also explore notions of Hardy-Weinberg equilibrium for large, stable populations. Is the genetic makeup of our flying hamster population changing? The Hardy-Weinberg equilibrium can serve as a reference point as we try to answer population genetics questions.
3. Hardy-Weinberg Equilibrium II: The Equation
The Hardy-Weinberg equilibrium equation is represented by a polynomial, so we'll have to do some calculations. Don't be intimidated; a few coin tosses can help us make sense of allelic frequencies in a given gene pool.
4. Hardy-Weinberg Equilibrium III: Evolutionary Agents
In this lesson, you'll learn how the Hardy-Weinberg equation relates to different evolutionary agents and population changes. Discover how the equation may be used to discover populations that are not in equilibrium.
5. How Gene Pool Diversity Affects a Group's Survival Potential
Humans are genetically the same yet very different. These differences are important, not just for humans but for all species because it makes it possible for populations to adapt to changing environmental conditions, which is essential to their survival.
6. Animal Mating Systems, Mate Choice, Sexual Selection & Male Competition
Choosing a mate is the single most important thing that most animals will do for the continuation of their species. In this lesson, we look at what goes into mate selection, as well as how that biology may influence who we fall for.
7. Environmental Changes & Adaptation in Organisms
In this lesson, we will discuss what happens when an organism is forced to deal with environmental changes. You will learn what adaptation is and how organisms benefit from it.
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- Gene Mutations
- DNA and Technology
- The Origin and History of Life On Earth
- The Theory of Evolution
- Natural and Artificial Selection
- Organism Classification & Phylogenesis
- Ecological Systems and the Environment
- Ecological Relationships and Species Populations
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- Methods of Scientific Research
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- Famous Biologists and Their Impact on Society
- About the STARR Tests
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