About This Chapter
Natural and Artificial Selection - Chapter Summary
This chapter focuses on evolution, specifically natural and artificial selection. This chapter provides simple definitions and explanations for the process of evolution as it applies to natural selection, and how humans have benefited from artificial selection. Main sections of this chapter include:
- Natural selection and adaptation
- Types of natural selection
- Phenotype and genotype
- Rapid adaptation
- Artificial selection in evolution
This chapter uses engaging study methods that focus specifically on the uses and results of evolutionary selection, making the learning experience faster and easier. You will be led through our brief lessons by expert instructors, but if you need any further assistance, you may submit your request to our specialists and they will reply as soon as they can.
1. 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.
2. Natural Selection: Definition, Types & Examples
We'll take a look at the types of natural selection that can occur. From flying hamsters to moths, you'll start to grasp the different paths organisms can take as they respond to their changing environments over time.
3. Why Natural Selection Acts on Phenotype, Not Genotype
Evolution works through the mechanism of natural selection. This mechanism influences the genetic make-up of populations, acting on the population's physical traits. In this lesson, we'll explore examples of why this is.
4. An Example of Rapid Adaptation: The Peppered Moths
Normally, adaptations occur over thousands or millions of years. However, drastic changes in the environment can shorten the time period in which a change comes about. In such cases, we can learn a lot about the evolutionary process and how natural selection drives it forward.
5. Artificial Selection in Evolution
Humans have been selectively breeding for desirable traits in plants and animals for a long time. This artificial selection allows for a lot of control in the breeding process but can also lead to unintended mutations within a population of organisms.
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