1. Evolution Homologous structure
To see where we might be going, we must understand where we have been
Robert Tamarkin, 1993

2. Evidence of Evolution

3. Comparing anatomy
Homologous Structure: structures that are shared by related species and that have been inherited from a common ancestor

5. Example-

10. Homologous and Analogous Structures Summary - #22 Evolution Study Guide
H = Homologous Structures A= Analogous Structures
Frog limbs and Chicken limbs = H (similar structure and function)
Butterfly Wing and Bird Wing = A (similar function/not structure)

11. Leg of a dog and a flipper of a whale = H
Homologous and Analogous Structures Summary - #22 Evolution Study Guide
H = Homologous (similar structure/ varied functions) – common ancestry
A= Analogous (similar function/not structure) – common environmental pressures
Leg of a dog and a flipper of a whale = H
Jointed leg of insects and humans = A
Fins of fish and flippers of whales= A

12. Dog leg and human leg-
Both mammals
Homologous structures

13. Analogous Structure