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27.1 Evidence of Evolution
Many fields of biology provide evidence that common descent has occurred.

1. List the categories of evidence in support of evolution.

2. How long have unicellular prokaryotes existed compared to multicellular eukaryotes?
Essential Study Partner
Evidence for Evolution
Geologic Time
Continental Drift
Geologic Processes

Art Quizzes
Embryos and Evolutionary History
Cytochrome c Evolution
Phylogenetic Tree of Globin Gene

Animation Quizzes
Plate Tectonics
Molecular Clock

General Biology Weblinks
Evolutionary Biology
27.2 Origin of Life
A chemical evolution proceeded from small organic molecules to macromolecules to protocell(s).

The first cell was bounded by a membrane and contained a replicating system, that is, DNA, RNA, and proteins.
3. How was the primitive atmosphere, that allowed for the evolution of simple organic molecules, different from the atmosphere of earth today?

4. Considering the origin of cells, which likely arose first - autotroph or heterotroph?
Essential Study Partner
Origin of Life
Key Events

Art Quizzes
Miller-Urey Experiment
Miller-Urey Experiment Results
Current Bubble Hypothesis
27.3 Process of Evolution
Populations evolve and not individuals; evolution is defined in terms of population genetic changes.

There are several agents of evolutionary change, one of which is natural selection.

Natural selection is the mechanism resulting in adaptation to the environment.
5. List the five agents of evolutionary change.

6. How do pesticides and antibiotics lead to resistant insects and bacteria, respectively?
Essential Study Partner
Natural Selection
Types of Selection
Other Processes
Before Darwin
Voyage of the Beagle

Art Quizzes
Hardy-Weinberg Equilibrium
Types of Natural Selection
Evolutionary Pace
Correlation Between Sickle Cell Allele and Malaria

Animation Quiz
Hardy-Weinberg Equilibrium

Study Guide
Evolution I: Microevolution and Selection
27.4 Speciation
New species come about when populations are reproductively isolated from other similar populations.

Species are classified into seven hierarchical categories according to shared characteristics. At each level above species, there are more and more types of species in the category.
7. How do subpopulations become separate species?

8. What are the two hypotheses about the pace of evolution and how do they differ?
Essential Study Partner
Allopatric Speciation
Sympatric Speciation
Three Domains
Constructing Phylogenies

Art Quizzes
Taxonomic Hierarchy
Traditional Versus Cladistic Taxomony
Tree of Life
Evolutionary Relationships Among Kingdoms

General Biology Weblinks
Taxonomy & Phylogenetics

Inquiry into LifeOnline Learning Center with Powerweb

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