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Kami Export Logan Owsley CladogramsSE - Document preview page 1

Kami Export Logan Owsley CladogramsSE - Page 1

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Kami Export Logan Owsley CladogramsSE

Explore evolutionary relationships using cladograms! Compare physical traits and molecular data to understand how species like deer, turtles, and worms are related through common ancestry.

Alice Edwards
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Kami Export Logan Owsley CladogramsSE - Page 1 preview imageAGizmosName:Date:Student Exploration: CladogramsVocabulary: adaptation, amino acid, amnior. araodaccyla. bipedal, clade, cl adisties. clanogram.convergent evolution, evolution, flower, mammary glands, molecular, morphological.multicellular, parsimony, sagittal crest, phloem, selenodont teeth, SNP, xylemPriorKnowledge Questions (Dothese BEFORE usingtheGizmo.)1.Look at the images below. Which two organisms do you think are most closely related?i think the turtle and thedeer2. Why do you think SO?I say the turtle arid deer because they have tails and legs and arms arid mouths r»oseand ears and worms dont have that they dont have arms and legsGizmoWarm-upCladi sties is a methoo of hypothesizing the evolutionaryrelationships between species.A cladogramis a branching diagramthat illustrates these relationships. For example, the cladogram on theright shows that neer are more closely related to turtles than toworms. In theCladogramsGizmo, you will usemorphological(physical characteristics) andmolecularData to create cladograms.To begin, make surePlantsis selected for the Organism group ardMorphologicalisselected for the Data type. Click on one of the characteristics to the left of the table on theTABLE tab. Information about the characteristic will be shown on the ORGANISM tab.Using the information on the ORGANISM tab. describe each of the characteristics below.Xylemardphloem'l l ! i s u e sl hpiarits thattransport water andtoiinesHie plant and the fooddawn the piihl.Flowersis a part of a plant containingreproductive organs surrounded by brightly colored petals.Multicellularitya Gf9a f l l S n1composed of more than one cell.
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Kami Export Logan Owsley CladogramsSE - Page 2 preview imageActivity A:Get the Gizmo ready:Check thatPlantsandMorphologicalare stillselectee for the group and data typeMorphologicalcladogramQuestion: Mow do you build a simple cladogram based on physical characteristics?1.Fill in: Using what you learnec in the warm-up. fill in the table. Clicking one of the boxes ofthe table will add a check mark to indicate the presence of a characteristic. Then, selectChecktable and aejust anyofthe boxes you may have filled in incorrectly.flowc*rBWhich organism has the fewest shared characteristics?2.Organize: Now you are ready to organize the table.A. How many characteristics (check marks) does each organism have?n32iAlgae:Arabidopsis:Cycad:Moss:Drag the arrows {) below the table to order the organism columns from fewestcharacteristics on the left to most on the right.B. How many organisms have each characteristic?Multicellularity:JXylem and phloem:Flowers:Drag the arrows to the right of the table to order the characteristics from fewestorganisms on the top to most on the bottom.3.Build: Select the CLADOGRAM tab at the top left. The goal of a cladogram is to show therelationships among a group of organisms. Organisms that are most closely related shouloshare the most recent common ancestor (highest branch on the tree). Organisms that aremost distantly related should share the oldest common ancestor (lowest branch on the tree).Click the segments on the clanogram templateto build your own cladogram that shows howyou think the different plants are related.Sketch you cladogram in the space to the right.Answer the following questions based on your cladogram.,iMt,- u*tcycad and arabidopisA. Which two organisms are most closely related?B. Which organism is most distantly related from the other three?algae and arapidopis(Activity A continued on next page)
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Kami Export Logan Owsley CladogramsSE - Page 3 preview imageActivity A (continued from previous page)4.Analyze: On a completed cladogram, the orange dot that connectstwo branches represents a common ancestor. In the cladogram tothe right, organisms E and C descended from a common ancestor(D) that was more recent than the common ancestor (E) oforganisms A, B. and C.Describe how the organisms in your cladogram are relatec through common ancestors.Arabdopsis and Algae sharethemost distant common ancestor. After that Arabidlopsis andMas!; si ire a common aHtrstor Arabicfopsir. <nid Treadslmrr the most rrcr-iJcommor-ancestor.5.Label: The purple lines represent a characteristic change, or adaptation. On the cladogramabove, organisms B and C share characteristic 3. Organism B either gained or lostcharacteristic 1 after diverging from organism C.In the Gizmo, select a purple line to open a text box anu fill in the characteristics.Based on your cladogram, from oloest to newest, iin what order oid the three characteristics(flowers, multicellularicy. and xylem/’ phloem) evolve?Multiecllulanty. lykrn/plilocfn,flowers6. Score:The parsimony principle states that the most likely solution is usually the simplest. Ingeneral, biologists try to create cladograms that require the fewest evolutionary changes.For example, it is more likely that xylem and phloem evolved once rather than multipletimes. The "parsimony score" calculates how many changes occur in a given cladogram.3AHow many changes (purple lines) occurreo in your ciao ogram?B.SelectShow parsimonyscore . What is the score of your ciao ogram?C.Select Show best possible parsimony scoreHave you created a cladogram withsithe least number of possible characteristic changes?7.ReviseIf you have not creareo a ciao ogram with the lowest possible parsimony score,adjust the cladogram until you do. Make sure that the organisms are ordereo from fewestshared characteristics on the left to most shared characteristics on the right.SelectShow accepted cladogram.Does your cladogram match the scientifically acceptedcladogram?Click the camera (tt)to take a snapshot of your cladogram. Right click the image, selectCopy, and then paste the image into a blank document that you will turn in with this sheet
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