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.
Earning College Credit
Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.
To learn more, visit our Earning Credit Page
Transferring credit to the school of your choice
Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.
Other chapters within the General Studies Science: Help & Review course
- Chemical Compounds & Bonds Overview
- Drawing Conclusions from a Scientific Investigation
- Electricity Fundamentals & Overview
- Energy & Heat Overview
- Essential Biology Concepts
- Essential Chemistry Concepts
- Essential Concepts in Physics
- Genetics & Evolution Overview
- Food Webs Overview
- Components of Living Things
- Intro to Biodiversity, Adaptation & Classification
- Human Body Systems: Functions & Processes
- 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
- Scientific Data: Organization, Analysis & Drawing Conclusions
- Types of Living Things
- Plant Structure & Processes
- Fundamentals of Matter
- Mechanics of Physics
- Introduction to Relativity
- Fundamentals of Electricity
- Introduction to Magnetism
- Fundamentals of Waves, Sound and Light
- Space, The Solar System and the Universe
- Introduction to Atmospheric Science
- Geology Basics
- Fundamentals of Genetics