How To Create A Dichotomous Key Packet

Organisms

Step One: Create a Trait List

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

Step Two: Create a Network Tree

Organisms

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

All Organisms YES NO Feet YES Feathers NO

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

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

Step Three: Create Dichotomous Key

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

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

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.