The student will learn how to construct a cladogram from morphological data Instructional techniques Lecture, Cladogram construction activity Instruct...
How to Make a Cladogram (Adapted from ENSI/SENSI lesson plan: Making Cladograms http://www.indiana.edu/~ensiweb/home.html) Cladograms are diagrams which depict the
Interpreting a Cladogram First, let’s practice interpreting some cladograms. Looking at the images, answer the questions below 1. Which speciesis the outgroup?
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How to Make a Cladogram (Adapted from ENSI/SENSI lesson plan: Making Cladograms http://www.indiana.edu/~ensiweb/home.html)
Cladograms are diagrams which depict the relationships between different groups of taxa called “clades”. By depicting these relationships, cladograms reconstruct the evolutionary history (phylogeny) of the taxa. Cladograms can also be called “phylogenies” or “trees”. Cladograms are constructed by grouping organisms together based on their shared derived characteristics. Example: 1. Given these characters and taxa: Characters Vertebrae Two pairs of limbs Mammary glands Placenta
Shark X
Taxa Bullfrog X X
Kangaroo X X
Human X X
X
X X
2. Draw a Venn diagram. Start with the character that is shared by all the taxa on the outside. Inside each box, write the taxa that have only that set of characters.
Placenta: Human Mammary glands: Kangaroo Two pairs of limbs: Bullfrog BHBu Vertbrae: Shark
3. Convert the Venn diagram into a cladogram like so: Shark
Bullfrog
Kangaroo
Human
Placenta Mammary glands Two pairs of limbs Vertebrae
Name:______________________ Period:______
Date__________
Cladogram Worksheet Convert the following data table into a venn diagram, and then into a cladogram: Characters Sponge Cells with X flagella Symmetry Bilateral symmetry Mesoderm Head develops first Anus develops first Segmented body Calcified Shell Chitonous Exoskeleton Watervascular system Vertebrae
1. The student will learn the difference between traditional classification and cladistic 2. 3. 4. 5.
classification, and why cladistic classification is preferred by modern biologists. The student will learn about monophyletic, paraphyletic and polyphyletic taxa, and why proper clades can only be monophyletic. The studnt will learn how a cladogram illustrates an evolutionary hypothesis and makes predictions about evolutionary events. (i.e. the scientific method) The student will learn how cladograms depict relationships between taxa, and represent a “family tree” of life. The student will learn how to construct a cladogram from morphological data
Instructional techniques Lecture, Cladogram construction activity Instructional material Powerpoint projector/computer Content Instructor will use a powerpoint presentation to introduce objectives 1-4. Instructor will guide students as a group through cladogram activity, leaving incomplete work as homework.
