Dichotomous Keys.

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Direct Instruction: Dichotomous Keys

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Presentation transcript:

Dichotomous Keys

A dichotomous key is a tool that scientists can use to identify an unknown organism or specimen. Keys

Examples include… insects Dichotomous Keys

trees Dichotomous Keys

rocks Dichotomous Keys

and shells. Dichotomous Keys

The word dichotomous means “divided in two parts.” Keys

Characteristics of a Dichotomous Key Keys

Consists of a series of two part characteristics of a specimen. statements that describe the characteristics of a specimen. Dichotomous Keys

Dichotomous Keys

The user is presented with two choices. Dichotomous Keys

Dichotomous Keys

As the user makes a choice, they are led to a new branch of the key. Dichotomous Keys

Dichotomous Keys

In the end, the user is led to the name of the specimen. Dichotomous Keys

Dichotomous Keys

Constructing a Dichotomous Key Keys

Separate the specimens into two groups based on one characteristic. Dichotomous Keys

Example: A deck of playing cards could be separated into black cards and red cards. Dichotomous Keys

Continue to separate the groups until each specimen has its own set of characteristics. Dichotomous Keys

Red cards can be separated into hearts / diamonds, then Example: Red cards can be separated into hearts / diamonds, then picture / number cards then male / female cards, etc. Dichotomous Keys

Make the choice a positive one – for example, something “is” instead of “is not.” Dichotomous Keys

Dichotomous Keys Example: 2a.Black card is a spade…….4 2b.Black card is a club……….5 4a.Spade is a picture card…6 4b.Spade is a number card…7 6a.Picture card is male……….8 6b.Picture card is female…..9 Dichotomous Keys

Start both choices in a pair with the same word. Dichotomous Keys

Example: Dichotomous Keys 2a.Red card is a heart……….4 2b.Red card is a diamond……5 Dichotomous Keys

Start the next pair with different words. Dichotomous Keys

Example: Dichotomous Keys 2a.Red card is a heart……….4 2b.Red card is a diamond……5 4a.Heart is picture card…….6 4b.Heart is number card…….7 6a.Picture card is male……….8 6b.Picture card is female……9 Dichotomous Keys

There should be one less step than the total number of specimens to be identified. Dichotomous Keys