Shown below are images of the skeletal structure of the front limbs of 6 animals: human, crocodile, whale, cat, bird, and bat. Each animal has a similar set of bones. Color code each of the bones according to this key:
Humerus [ ] Ulna [ ] Radius [ ]
Carpals [ ] Metacarpals [ ] Phalanges [ ]
For each animal, indicate what type of movement each limb is responsible for.
The whale fin needs to be longer to help in movement through water. Thumbs are not necessary as the fins are not used for grasping.
Homologous vs. Analagous Structures You have now studied two different types of anatomical structures:
Homologous structures: closely related in _________________________, but have different _________________________________. Seen in animals that are closely ______________________.
Analogous structures have very different ___________________________, but similar ________________________. Seen in animals that do not have a common _________________________, but need similar ________________________________
Determine whether the following sets of structures are homologous or analogous based on your findings in today’s activities:
Human arm and crocodile arm ____________________________________
Bird wing and bat wing ___________________________________________
Human arm and whale fin _________________________________________
Cat limb and whale fin _____________________________________________
Compare the anatomy of the butterfly and bird wing below.
1. What is the function of each of these structures?
2. How are they different in form? Give specific differences.
3. Are butterfly wings and bird wings homologous or analogous structures? Why?