Download - Dichotomous Key
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Dichotomous Key
Using Observable Characteristics
to Identify Objects
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What is a dichotomous key?A dichotomous key is a tool that allows the user to
determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish.
Keys consist of a series of choices that lead the user to the correct name of a given item.
"Dichotomous" means "divided into two parts". Therefore, dichotomous keys always give two choices in each step.
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Using a dichotomous keyAt each step of the process of using the key, the user is
given two choices; each alternative leads to another question until the item is identified.
1a. If the leaves are flat….go to question 4. 1b. If the leaves are needle-like….go to question 2.2a. Are the needles in a bunch? Go to question 52b. Are they spread along the branch?“…pine tree
Eventually, when enough questions have been answered, the identity of the tree is revealed.
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DICHOTOMOUS KEY EXAMPLE
1. a. tail fins are horizontal—whale………………….go to 2 b. tail fins are vertical—fish……………………….go to 32. a. has teeth or tusk—toothed whale………………..go to 4 b. has no teeth………………………...BALEEN WHALE3. a. has gill slits behind mouth—shark…….………...go to 5 b. has no gill slits……………………..NONSHARK FISH4. a. black with white underside………….KILLER WHALE b. tusk, gray with dark spots………………....NARWHAL5. a. head is hammer-shaped……..HAMMERHEAD SHARK b. tail is half the body length……….THRESHER SHARK
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StartUse a dichotomous key to identify these individuals.
Pick an individual to identify, When you are ready click start.
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Is the individual male or female?
Male Female
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Is the individual wearing a hat?
Hat No Hat
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Is the individual in the military?
Military Not Military
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Is he wearing a dress uniform or a camouflage uniform?
Dress Uniform
CamouflageUniform
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Introducing
He is a man wearing a hat and a military dress uniform.
Arnold
Return to Start
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Introducing
He is a man wearing a hat and a camouflage military uniform.
Hector
Return to Start
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Introducing
He is a man wearing a hat, but not wearing a military uniform.
Greg
Return to Start
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Does the individual have facial hair or is he clean shaven?
FacialHair
CleanShaven
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Is the individual wearing black?
WearingBlack
Not WearingBlack
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What is the individual wearing?
Suit Jeans
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Introducing
He is a man with facial hair, wearing a black suit, but not wearing a hat.
Reggie
Return to Start
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Introducing
He is a man with facial hair, wearing a black shirt and jeans, but not wearing a hat.
Hugo
Return to Start
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Introducing
He is a man with facial hair who is not wearing black or a hat.
Bill
Return to Start
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What is the individual wearing?
Shorts Pants
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Introducing
He is a clean shaven man who is wearing shorts, but not black or a hat.
Jack
Return to Start
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Introducing
He is a clean shaven man who is wearing pants, but not black or a hat.
Kurt
Return to Start
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Is the individual wearing a hat?
Hat No Hat
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Is the individual wearing purple?
WearingPurple
Not WearingPurple
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What is the individual wearing
Green Boaand Hat
Red Boaand Hat
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Introducing
She is wearing a purple dress and green boa and hat.
Doris
Return to Start
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Does the individual have a purse?
Purse No Purse
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Introducing
She is wearing a purple dress and red purse, boa, and hat.
Erin
Return to Start
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Introducing
She is wearing a purple dress and red boa and hat.
Rhonda
Return to Start
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Introducing
She is wearing a hat, but not wearing purple.
Gail
Return to Start
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What is the individual wearing?
Pants Skirt
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Introducing
She is wearing pants, but not a hat.
Jenny
Return to Start
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What color boots is the individual wearing?
Red Black
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Introducing
She is wearing a skirt and red boots, but not a hat.
Mary
Return to Start
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Introducing
She is wearing a skirt and black boots, but not a hat.
Beth
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MAKING A DICHOTOMOUS CLASSIFICATION KEY
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POSSIBLE“DERIVED CHARACTERS”
• All made of one material
• Is it hinged
• Has a sharp edge
• Has holes
• Hammer-like head
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Hammer-like head Other types of head
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Hammer-like head Other types of head
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Hammer-like head Other types of head
ALL Made of Wood
Made of Wood and other materials
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Hammer-like head Other types of head
Sides of head are different
Sides of headare same
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Hammer-like head Other types of head
Sides of head are different
Sides of headare same
All wooden NOT all wooden
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Hammer-like head Other types of head
Sides of head are different
Sides of headare same
All wooden Wooden and rubber? ?
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Objects made of One Material Objects made of more than One Material
Divide the rest of the items until each one has been identified.