The Tree of Life. Modern Evolutionary Classification. Problems With Traditional Classification. Appearances Are Deceiving Fish, Dolphins & Sharks What Characteristics Are Important & Which Are Most Important?. Limpets, Barnacles, Crabs. Traditional Classification. Cladogram.
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Modern Evolutionary Classification
Appearances Are Deceiving
Fish, Dolphins & Sharks
What Characteristics Are Important & Which Are Most Important?
Biologists Now Group Organisms Into Categories That Represent Lines Of Evolutionary Descent, Not Just Physical Similarities
Is The Strategy of Grouping Organisms Together Based On Their Evolutionary History
Use of Evolutionary History is referred to as Phylogeny
It Is Not Obvious or Easy
Identifies and Considers Only Those Characteristics Of Organisms That Are Evolutionary Innovations
New Characteristics That Arise As Lineages Evolve Over Time
Traits That Can Be Used To Figure Out Evolutionary Relationships
Appear In Recent Parts of a Lineage
Not In its Older Members
Used To Construct A Cladogram
A Diagram That Shows The Evolutionary Relationships Among a Group of Organisms
Shows How One Lineage Branched From Another In The Course of Evolution
The Genes of Many Organisms Show Important Similarities At The Molecular Level. These Similarities Can Be Used As Criteria To Help Determine Classification
Functional Protein Unit of Muscle Fibers
Found In Yeast (?)
Protein In Yeast Interacts With Other Proteins To Allow Internal Yeast Structures To Move
Has Cleared Up Classification Questions,
Which Two Are More Closely Related?
Storks, American Vultures, African Vultures
DNA Can Mark The Passage of Evolutionary Time
Mutations Occur At A Somewhat Measurable Rate
If They Change The Phenotype, They Are Subject To Natural Selection
If They Don’t Change The Phenotype, They Accumulate In The DNA
The Degree of Difference Due To Accumulated Mutations, Indicates How Recently They Shared A Common Ancestor
Different Genes “tick” At Different Rates Allowing Comparison & Validation