1. How To Create A Dichotomous Key Packet

2. Organisms

3. Step One: Create a Trait List

4. Trait List For Animals 1. Sea turtle Hard shelled body
Legs used as fins
Reptile
2. Iguana
Four legs
Tail
3. Frigatebird
Feathers
Beak
Claw feet
Bird
4. Blue-footed booby
Feathers
Beak
Webbed feet
Bird
5. Galapagos tortoise
Hard shelled body
Four legs
Reptile
6. Hammerhead shark
Fins
Broad nose face
Fish

5. Step Two: Create a Network Tree

6. Organisms

7. All Organisms
Feet NO
YES
Choose a trait to separate organisms into two groups. Be sure this trait is a yes or no situation.

8. All Organisms
YES NO
Feet
YES
Feathers NO

9. All Organisms Feathers Blue feet YES NO YES YES Shell body NO NO
Frigatebird
Galapagos tortoise
Iguana
Blue-footed booby

10. All Organisms Feathers Blue feet YES NO YES Shell body NO
Hammerhead Shark
Sea Turtle
YES
Blue feet
YES
Shell body NO NO
Frigatebird
Galapagos tortoise
Iguana
Blue-footed booby

11. Step Three: Create Dichotomous Key

12. All Organisms #1 Feathers #2 #5 Blue feet #4 #3 YES NO YES Shell body
Hammerhead Shark
Sea Turtle
YES
Blue feet
YES
Shell body NO NO #3 #4
Frigatebird
Galapagos tortoise
Iguana
Blue-footed booby

13. All Organisms #1 Feathers #2 #5 Blue feet #4 #3 YES NO YES Shell body
Hammerhead Shark
Sea Turtle
YES
Blue feet
YES
Shell body NO NO #3 #4
Frigatebird
Galapagos tortoise
Iguana
Blue-footed booby

14. Animal Dichotomous Key
1. A. Has feet. Go to 2.
B. Does not have feet. Go to 5.
2. A. Has feathers. Go to 3.
B. Does not have feathers. Go to 4.
3. A. Has blue feet. Blue-footed booby.
B. Does not have blue feet. Frigatebird.
4. A. Has a shell body. Galapagos tortoise.
B. Does not have a shell body. Iguana.
5. A. Has a shell body. Sea Turtle.
B. Does not have a shell body. Hammerhead shark.