About This Chapter
Scientific Concepts for the Living Environment- Chapter Summary
These lessons have been compiled to help you study significant information about the living environment. With these lessons, you will follow along with our expert instructors and review:
- Different life cycles
- How genetics affects crops and livestock
- Relationship between model organisms and genetics
- The theory of evolution
- Adaptations of species
- How food chains and food webs affect ecosystems
- How to tell if a reaction favors reactants or products
The lessons in this chapter are informative and illustrative. Each lesson covers the topics listed above in about five to ten minutes. The lesson transcripts also have bold print terms and phrases, so you know where to focus your studies. When you are prepared, you can assess your knowledge with the short lesson quizzes and a chapter exam. You will receive immediate results with those quizzes and exam.
1. What is a Life Cycle? - Definition, Stages & Examples
In this lesson, you'll learn the definition of 'life cycle' and find out about the three basic stages of a life cycle. You'll also explore examples of different life cycles.
2. 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.
3. Human Genetics: Multifactorial Traits & Model Organisms
How do we study human genetics when most traits arise from multiple genes? It's certainly more complicated that drawing a simple Punnett square. Never fear, for model organisms are here!
4. Theories of Evolution: Lamarck vs. Darwin
We'll look at the interplay between population genetics and environment. Are traits individually acquired or do entire populations evolve? The flying hamsters and a few other notable experiments will provide the answers.
5. Natural Selection & Adaptation: Definition, Theory & Examples
How does natural selection help shape the amazing types of animals we witness around us? In this lesson, we'll explore adaptations and what they can tell us about a species' past evolution.
6. Food Chains, Trophic Levels and Energy Flow in an Ecosystem
In this lesson, you'll learn about food chains, food webs, and the different roles that organisms play in an ecosystem. You'll also learn about how energy flows through an ecosystem.
7. Equilibrium: Chemical and Dynamic
Learn the definition of chemical equilibrium and how it is dynamic. Discover what the equilibrium constant is and how it shows whether the reaction favors the reactants or products. Learn how chemists designate equilibrium in an equation and how they show the difference in reaction rate.
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