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Ch 8: Evolutionary Principles

About This Chapter

7 Lessons in Chapter 8: Evolutionary Principles
Test your knowledge with a 30-question chapter practice test
Why Natural Selection Acts on Phenotype, Not Genotype

1. 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.

How Gene Pool Diversity Affects a Group's Survival Potential

2. 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.

Scientific Evidence That Supports Evolution

3. Scientific Evidence That Supports Evolution

Evolution explains how species that are present on Earth today are modified descendants of their ancestors. This scientific theory is supported by many different types of evidence, which show how evolution is a very real and natural phenomenon.

Fossil Evidence for Biological Diversity, Speciation, & Mass Extinction

4. Fossil Evidence for Biological Diversity, Speciation, & Mass Extinction

One of the best sources of evidence we have for evolution is the fossil record. Fossils provide a wealth of information on how species change over time and for exciting events like mass extinctions and new species formation.

Causes of Microevolution: Natural Selection, Gene Flow & Genetic Drift

5. 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.

What Is Convergent Evolution?

6. What Is Convergent Evolution?

It can be difficult to tell whether species are related just by looking at them. Organisms look and act the way they do because of ancestry, but similarities also arise because of similar environmental roles, as is the case with convergent evolution.

Individual Accommodation vs. Gradual Adaptation

7. Individual Accommodation vs. Gradual Adaptation

Sometimes we encounter new environmental conditions that take some getting used to. As individuals, our bodies may quickly and temporarily accommodate for the short-term, but populations may adapt gradually for the long-term.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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