About This Chapter
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.
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.
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.
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.
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.
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.
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.
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Other chapters within the General Studies Science: Help & Review course
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- Drawing Conclusions from a Scientific Investigation
- Electricity Fundamentals & Overview
- Energy & Heat Overview
- Essential Biology Concepts
- Essential Chemistry Concepts
- Essential Concepts in Physics
- Food Webs Overview
- Foundations of Chemical Compounds & Bonds
- Foundations of Chemical Reactions, Acids, and Bases
- Foundations of Energy & Heat
- Foundations of Magnetism
- Fundamentals of Mechanics
- Lab Equipment for Scientific Study
- Measurement & the Metric System Fundamentals
- Nuclear Energy Fundamentals
- Planning a Scientific Investigation Or Experiment
- Plant & Soil Ecology
- Populations & Relationships in Ecology
- Sound & Light Waves
- Studying Biological Communities
- The Periodic Table, Atoms & Elements
- Using Data for Investigation & Experimentation