About This Chapter
Charles Darwin is widely known for his significant work on evolution. If he were around today, what do you think he might say if he saw a flying hamster? Based on our knowledge of Darwin, we can guess that he would probably look for its evolutionary advantages. Why did certain hamsters develop wings when others didn't? Are flying hamsters more likely to survive than their wingless counterparts? Why or why not? As you watch these lessons on the principles of evolution, you'll begin to understand what influential evolutionary theorists, like Charles Darwin, can teach us.
You'll delve deeper while studying the various ways in which certain species survive or fail to survive and what factors influence those outcomes. For example, you've probably heard of natural selection. Now you can learn about how species are affected by natural selection, as well as genetic drift, mutation, migration and extinction. Additionally, you'll watch lessons on the Hardy-Weinberg equilibrium, a concept that helps us to understand if evolutionary agents are present and affecting a population we want to study.
Evolution isn't only about species changing or dying out. It's also about the emergence of new species, like those flying hamsters. There are many ways that a species that previously didn't exist can come to be. Among the topics you'll learn about related to speciation are geographic speciation, temporal isolation and gametic isolation. But since new species don't always thrive, you'll also learn about hybrid infertility and other topics that prevent new species from succeeding.
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1. 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.
2. Hardy-Weinberg Equilibrium: Definition, Equation & Evolutionary Agents
In this lesson we will define Hardy-Weinberg equilibrium and break down the Hardy-Weinberg equation to figure out if a population of hypothetical beetles is evolving.
3. 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.
4. 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.
5. Speciation: Allopatric and Sympatric Speciation
Discover the definition of a species and learn more about how species split. Find out common terms related to the splitting of species and study what role polyploidy plays in the development of a species.
6. Prezygotic Reproductive Barriers & Speciation: Definition & Examples
We may take for granted why animals choose to mate with other animals of similar appearance, but it's not that simple. There are actually biological barriers to reproduction that can prevent even seemingly closely related species from reproducing. This lesson looks at one such category of hindrances, prezygotic barriers, which make fertilization impossible.
7. Postzygotic Reproductive Barriers: Definition & Examples
Do flying hamsters represent a separate species from your run-of-the-mill hamsters? We'll get to the bottom of this by performing crosses between the two hamster types. You'll explore postzygotic reproductive barriers and their possibly tragic consequences.
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Other chapters within the Biology 101: Intro to Biology course
- Basic Terms & Skills in Biological Science
- Inorganic Chemistry Review for Biology
- Introduction to Organic Molecules & Heterotrophs
- The Nucleotide Structure of DNA & RNA
- Enzyme Function, Interactions & Regulation
- Cell Membrane Model, Components & Transport
- Cell Structure, Organelles & Organelle Functions
- Processes & Steps of DNA Replication
- Transcription, Translation & Protein Synthesis
- Types & Effects of Genetic Mutations
- Cellular Metabolism & Respiration
- Cell Growth & The Process of Cell Division
- The Musculoskeletal, Circulatory, Respiratory, Digestive & Excretory Systems
- The Nervous System & Endocrine System
- Reproduction, Development & Survival in Animals
- Mendelian Genetics & Mechanisms of Heredity
- Ecology Principles & Community Ecology
- Earth's Timeline & Geological Evolution
- Taxonomic Classification & Phylogeny
- Genetic Engineering & DNA Sequencing
- Studying for Biology 101