Welcome to Class

Define the patterns of evolution.

Agenda

• Phylogenetic tree notes• Why Evolution matters video • Review

Phylogenetic Tree

What is a Phylogenetic Tree?

• A branching diagram showing evolutionary relationships among species based on similarities and differences in physical and/or genetic characteristics

Uses of Phylogenetic Trees

• Organize knowledge of biological diversity, • Structure classifications, • Providing insight into events that occurred

during evolution. • Trees show descent from a common ancestor

This tree shows that gibbons diverged before other primate groups.

Chimps and humans diverged last.

SpeciesNumber of differences from

human cytochrome c

Monkey 1

Rabbit 4

Horse 6

Chicken 7

Frog 8

Turtle 8

Tuna 13

Shark 14

Why does evolution matter now?