october 23, 2014 objective: to look at evidence for evolution and arrange organisms in to cladograms...
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October 23, 2014
Objective: To look at evidence for evolution and arrange organisms in to cladograms based on common characteristics
Journal: What are three examples of evidence for evolution?
Cladistics
CLADISTICS IS CLASSIFICATION BASED ON COMMON ANCESTRY.
Phylogeny is the evolutionary history for a group of species.Supported by evidence from living species,
fossil record, and DNAShown with branching tree diagrams
Species placed in order that they descended from a common ancestor
Clade: is a group of species that shares a common ancestor.
– Each species in a clade shares some traits with the ancestor.
– Each species in a clade has traits that have changed.
Derived characteristics are traits shared by clade members– Determine how
species are arranged on a cladogram
– More closely related species share more derived characteristics
– Represented on cladogram as hash marks
FOUR LIMBS WITH DIGITS
Tetrapoda clade1
Amniota clade2
Reptilia clade3Diapsida clade4
Archosauria clade5
EMBRYO PROTECTED BY AMNIOTIC FLUID
OPENING IN THE SIDE OF THE SKULL
SKULL OPENINGS IN FRONT OF THE EYE &
IN THE JAW
FEATHERS & TOOTHLESS BEAKS.
SKULL OPENINGS BEHIND THE EYE
DERIVED CHARACTER
• Nodes represent the most recent common ancestor of a clade.
Diapsida clade4
FOUR LIMBS WITH DIGITS
Tetrapoda clade1
Amniota clade2
Reptilia clade3
Archosauria clade5
EMBRYO PROTECTED BY AMNIOTIC FLUID
OPENING IN THE SIDE OF THE SKULL
SKULL OPENINGS IN FRONT OF THE EYE AND IN THE JAW
FEATHERS AND TOOTHLESS BEAKS.
SKULL OPENINGS BEHIND THE EYE
NODE
DERIVED CHARACTER
CLADE
How to make a Cladogram Video: http://www.youtube.com/watch?v=ouZ9zEkxGWg
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