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