Dichotomous Keys.

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Direct Instruction: Dichotomous Keys

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Presentation transcript:

Dichotomous Keys

Dichotomous Keys A dichotomous key is a tool that allows the user to determine the identity of items in the natural world based on the items characteristics "Dichotomous" means “divided into two parts” Greek origin dichotomous keys always give two distinct choices in each step, often they are opposites Black/white; wings/no wings

Here are creatures we don’t know! How to use a Dichotomous Key? Here are creatures we don’t know! Lets choose one 3

How to use a Dichotomous Key? Choose only one creature at a time. 4

Decide which statement is true How to use a Dichotomous Key? Read steps 1a and 1b Decide which statement is true 1b is true

Then follow the directions after that step. How to use a Dichotomous Key? Then follow the directions after that step. Go to step 5!

At choice 5, you make another dichotomous choice How to use a Dichotomous Key? At choice 5, you make another dichotomous choice 5a is true Go to step 6!

C How to use a Dichotomous Key? Keep going until you come to a step that gives you the creature’s name. 6 a. The creature has one antennae Go to Step 7. C

How to use a Dichotomous Key? Choose a new creature and start at step 1a and 1b again. Continue until you find the creature’s name. C Where do you start Again?

Then, find the names of all the creatures Complete the Norn Dichotomous Key 10

What is a Cladogram? A cladogram is a diagram which shows relationships among organisms. A cladogram uses lines that branch off in different directions ending at a clade, a groups of organisms with a last common ancestor.

What is a Cladogram? There are many shapes of cladograms but they all have lines that branch off from other lines. The lines can be traced back to where they branch off. These branching off points represent a hypothetical ancestor which is inferred to exhibit the traits shared among the terminal taxa above it.

Go to the following site: http://ccl.northwestern.edu/dtttl2009/LS_426_- _The_Design_of_Technological_Tools_for_Thinking_and_Learning /Past_Projects/Entries/2008/3/11_Here_is_a_project_title_files/Tre eInteractive-02.swf Watch the video on how to build a cladogram. Then… Build your own cladogram 

Dichotomous Keys Complete the shark dichotomous key assignment.