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C LADOGRAMS AND K EYS Trees of Evolutionary Relatedness Identifying Organisms
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BR: P LANT EVOLUTION C LADOGRAM Ancestral photosynthetic prokaryote Mosses Vascular, seedless land plants Flowering Plants Green Algae A B 1. _____ Seeds in reproduction 2. _____ Waxy cuticle and vascular tissue 3._____First multi-cellular plant (internal reproductive structures) 4. _____ First plants to live on moist land 5. _____First photosynthetic eukaryote C D E
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O BJECTIVES AND HOMEWORK To explain in your own words what a cladogram is. Identify the different parts of a cladogram. Be able to explain the relationships among organisms in a cladogram. To understand the purpose of dichotomous keys and to use one to identify organisms. Homework: Make your own cladogram based on the wksht. On your cladogram, circle a node and explain what it represents List the two organisms that are most closely related and what adaptation(s) gave rise to those organisms
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CLADOGRAMS : RELATIONSHIPS LOOK LIKE T REES How are these trees similar? How are they different? Family Tree Tree of Life
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H OW TO READ A CLADOGRAM Common ancestor Evolutionary event (adaptation) Common ancestor of: ________ Descendant of _____ Which organism is the most ancient according to the cladogram? What adaptation occurred that gave rise to the perch fish?
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S OME CLADOGRAM VOCAB Nodes- The point at which new species will branch off of ancestor Branches- The descendants of the ancestors Clade- The group of organisms including ancestor and all descendants of that ancestor AEDC B Common ancestor node Node: ancestor of D and E Branch: descendant of common ancestor
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W HAT DOES THE CLADOGRAM TELL YOU ? Broad evolutionary relationships (evolution of plant kingdom) Specific evolutionary relationships (evolution of a particular genus of tropical fish) Particular characteristic and how that evolves (evolution of stripes in a genus of tropical fish)
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What is this a cladogram of? Find a node and describe what it represents Which species are most closely related?
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What does the red line represent? Which hominids are humans most closely related to? Which primates? Which primates are humans least closely related to? What is this a cladogram of?
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N OW P RACTICE Team up with a partner to answer questions about the three cladograms (7 min)
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D ICHOTOMOUS KEYS 1. Does it have feathers? Yes (go to 2) No (go to 3) 2. Does it swim? Yes---Duck No ---Hen 3. Does it have legs? Yes---Lizard No---Snake
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HOMEWORK Homework: Make your own cladogram based on the wksht. On your cladogram, circle a node and explain what it represents List two organisms that areclosely related and what adaptation(s) gave rise to those organisms
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M AKE YOUR O WN D ICHOTOMOUS KEY Make up names for the 6 butterflies Decide what characteristics you will use to group the butterflies Create a flow chart style key
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