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Notes 7-5
Branching Tree Diagrams
Branching Tree Diagrams
• Organisms with similar characteristics may be descended from a common ancestor
• The more similar the organisms are, the more recent the common ancestor probably is
A Branching Tree• Branching trees such as this show
relationships between groups of organisms. It also shows the order in which specific characteristics may have evolved.
Backbone
Four Limbs
Egg with shell
Cladogram
• A branching tree diagram is sometimes referred to as a cladogram
Shared Derived Characteristics
• Homologous structure that is shared by all organisms in a group.
• What do the organisms below all share? (What is their homologous structure?)
BACKBONE
Shared Derived Characteristics• A branching tree diagram shows evolutionary
relationships by grouping organisms according to shared derived characteristics.
ReptilesAmphibians
Egg with shellFishes
Four limbs
Backbone
Invertebrates
Ancestor of animals
Which of these characteristics probably developed first?
The Great Tree Of Life