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Organizing the Diversity of Life
Chapter 2Lecture Outline
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 2
Building Evolutionary Trees Systematist
Biologist who studies relationships among groups of organisms
Evolutionary treesSummary of the relationship of groups of
organisms
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© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 4
Constructing Evolutionary Trees Determine the distance of relationship
Similarity and differences Appearance Function
Tips of branches Different species
Common ancestors Branch points
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© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 7
Shared Derived Features Common ancestry
Descendants share features
Group of close relatives
Each level has unique shared features
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 8
Convergent Features Shared features
Not from common ancestorEvolved independentlyExample:
Opposable thumb Panda versus chimpanzee
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© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 10
DNA Comparisons DNA is hereditary material
Most accurate means of showing relationships
Appearance and function based on DNA The genetic material serves as a blueprint for the
characteristics
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 11
DNA and Characteristics Shared characteristics of DNA show
relatedness between groupsAble to compare groups that have little
apparent similaritiesExample: comparing bacteria, plants, animals
Show evolutionary relationships among many different groups
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 12
Predict the Biology of Organisms Evolutionary trees
Can be used to help make predictionsBased on shared derived featuresPrediction of characteristics and behaviors
of related organisms
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 13
Prediction of Parental Care A behavior characteristic may be predicted
based on the evolutionary tree
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© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 18
The Linnaean Hierarchy Classification system
Carolus LinnaeusLevels from smallest to largest
Species is lowest level Species grouped to form genus Scientific name
Genus: Homo Species: sapiens Homo sapiens
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 19
Levels of Linnaean Hierarchy
Seven levels
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 20
Highest Levels of Classification Two kingdoms
Described by Linnaeus
Plants and animals
Other classifications Five to eight kingdoms
Higher level: Domains Bacteria Archaea Eukarya
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© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 22
Tree of Life
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 23
Evolutionary Relationships Consider the mushroom, a fungus
Is it more like an animal or a plant? How about a yeast cell, also a fungus?
Is it more like a bacteria or an animal? Evolutionary trees
Based on DNA Help us to see less noticeable relationships Important for understanding the nature and
mechanisms of the organisms
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 24
Primate Evolutionary Tree Closest relatives to humans
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 25
Variations on the Tree of Life Horizontal gene
transferGenes moved
between lineages
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© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 27
Changes in Evolutionary Trees Changes occur as more information is
gathered Natural process of science
Evolutionary trees serve as a base for hypotheses
More information confirms or refutes ideasEvolutionary trees become more stable as
information is gathered
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 28
Concept QuizWhich of the following is the most accurate method of determining relatedness?
A. Common appearance
B. DNA
C. Common behavior
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 29
Concept QuizIf two species share a common characteristic, such as a long tongue, does that mean they evolved from common ancestors?
A. Yes
B. No
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 30
Concept QuizAccording to this evolutionary tree, which of the following is the least related to the fungi?
A. Bacteria
B. Plants
C. Animals
Biology in the NewsSasquatch Sighting Reported in Yukon Hair found after sighting of Sasquatch
DNA analysis of the hair Perfect match with bison DNA
If Sasquatch is a bipedal ape-man How would it fit with Linnaean hierarchy? With primates?
How could DNA match the bison if it’s a primate?
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 31
Terms
Archaea
Bacteria
Class
Convergent features
Domain
Eukarya
Evolutionary tree
Family
Genus
Horizontal gene transfer
Kingdom
Lineage
Linnaean hierarchy
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 32
Terms
Most recent common ancester
Order
Phylum
Scientific name
Shared derived features
Systematist
Taxon
© 2009 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 4/e 33
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Discover Biology StudySpace
http://www.wwnorton.com/college/biology/discoverbio4
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Additional Art from Chapter 2
All art files from the book are available in JPEG and PPT formats on the
Instructor Resource Disc
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