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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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How to use a Dichotomous Key
• Dichotomous Key in Action
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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
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Introducing
He is a man wearing a hat and a camouflage military uniform.
Hector
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Introducing
He is a man wearing a hat, but not wearing a military uniform.
Greg
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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
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Introducing
He is a man with facial hair, wearing a black shirt and jeans, but not wearing a hat.
Hugo
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Introducing
He is a man with facial hair who is not wearing black or a hat.
Bill
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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
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Introducing
He is a clean shaven man who is wearing pants, but not black or a hat.
Kurt
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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
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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
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Introducing
She is wearing a purple dress and red boa and hat.
Rhonda
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Introducing
She is wearing a hat, but not wearing purple.
Gail
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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
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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
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Introducing
She is wearing a skirt and black boots, but not a hat.
Beth
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