Do now: H

wednesday, January 25 Assign Yourself Finish Critical Thinking Question Due Tomorrow Take Out Materials Biorganizer – Cornell Notes page 98 Title: Taxonomic Tools

objective SWBAT classify organisms using scientific tools like dichotomous key and cladograms.

Question: What tools can be used to classify organisms? Answer:  Two methods scientists rely on to identify and classify organisms are dichotomous keys and cladograms.

Expand These tools help scientists determine how organisms are related through common ancestry. A dichotomous key is a type of flow chart made up of questions or paired statements about an organism. Following each of the steps of a dichotomous key helps scientists identify organisms based on their traits.

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expand A cladogram is a branched diagram resembling a tree that shows the evolutionary relationship among organisms. It is often used to show how similarities are derived from common ancestry. Places where a lineage branches off in a cladogram are called nodes. They represent speciation events. The fewer the number of nodes between organisms, the more closely they are related. Cladograms provide scientists with a visual summary of how organisms in any taxonomic grouping are related.

Speak only about taxonomic tools. Distractors will be prosecuted. Turn and talk Stay on task Speak only about taxonomic tools. Or Distractors will be prosecuted.

heck Yes/heck no (Choral Responses) A dichotomous key is a tool used to identify organisms based on their traits. Cladogram shows the evolutionary relationship among organisms. The lines that break from a cladogram represent speciation. Scientist use cladograms to get the name of organisms.

Quick Test (Eyes closed, thump up/down)

Prove it! Guided practice white boards out!

D

C

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Dichotomous key, cladogram, common ancestor Independent practice Critical Thinking Answer the following question in 2-3 paragraphs. Use the following words in your explanation. Dichotomous key, cladogram, common ancestor What tools can be used to organize organisms into a classification system?

Exit ticket Choose the correct answer and give a detailed explanation for your answer using the following vocabulary words: Organizing/classifying

A

Ipc do now Sort your bag of candy into groups you choose just like yesterday.

ipc Create a Dichotomous key with the candy using the poster board, markers and candy.