C PHYLOGENY theoretical evolutionary history of a species

C. PHYLOGENY - theoretical evolutionary history of a species 1. Cladogram - diagram depicting the proposed evolutionary relationships of a group of species -these are also called phylogenetic trees or family trees

a. example 1 A B C D E F is the common ancestor of all vertebrates is the common ancestor of all land vertebrates is the common ancestor of all calcium shell laying animals is the common ancestor of animals with scales covering some or all of body is the common ancestor of all animals with a single opening in side of skull is the common ancestor of all animals with ‘wing-like’ limb bones RAY-FINNED FISHES A AMPHIBIANS B TURTLES D C CROCODILES E BIRDS F DINOSAURS MAMMALS TIME PRESENT

note that all living species end up at the same point on the page eg. dinosaurs are extinct the length of the line indicates how long it has been since the species branched off

Example of a cladogram showing the relatedness of HIV isolates

b. Table pg 608 has information that will be used to build the cladograms on pg 609 c. Using Genetic Evidence pg 611 shows an example

lamprey pike lung fish turtle wolf bony shell lungs jaws human hair gorilla grasping hands

Now work on “Cladogram worksheet” #3 the cladogram here will include extinct species assume that if a species does not change, it dies out on Moodle the pictures can be found if you wish to manipulate on the screen & print