1. Assignment #6 Anatomical Similarities And Differences
Mrs. McCarthy
Biology
Tuesday, September 18, 2018

2. Comparative Anatomy- the study of similarities and differences in the anatomy of organisms
A. This demonstrates similar evolution and common ancestors among different species

4. B. Homologous Structures- structural features with a common evolutionary origin that may or may not be similar in function and appearance
1. Examples: Bones in the appendages of these animals
a. Bat
b. Whale
c. Cat
d. Pig
e. Crocodile
f. Human

5. Homologous Structures

6. C. Analogous Structures- Body parts of organisms that do not have a common ancestor but have a similar function
1. Examples: The wings in a
a. Bat
b. Bird

7. D. Vestigial Structures- structures that once had a use but are no longer functional
1. Examples:
a. Hipbone in Whale
b. Tailbone in Humans

8. II. Comparison
A. Complete the following chart by describing the organs as homologous, analogous, or vestigial
Organ(s)
Description
Human “tail bone”
Bat wings and Bird Wings
A whale’s femur and pelvic bones
Front limbs of birds, bats, dolphins
Human Canine Teeth
Elephant tusks and boar tusks
Cow horn and deer antler
Spider Fang and Snake Fang
Crab Exoskeleton and Turtle Shell
Human Appendix
Sea horse pouch and kangaroo pouch
Pelvic bone remnants in a snake
Vestigial
Analogous
Vestigial
Homologous
Homologous
Homologous
Analogous
Analogous
Analogous
Vestigial
Analogous
Vestigial