Making Cladograms Visualizing Evolutionary Relationships Essential Question(s) 1. How do phylogenetic trees and cladograms represent traits that are either derived or lost due to evolution. Enduring Understandings 1. Create a phylogenetic tree or simple cladogram that correctly represents evolutionary history and speciation from a provided data set. 2. Evaluate evidence provided by a data set in conjunction with a phylogenetic tree or a simple cladogram to determine evolutionary history and speciation. Modeling Directions • While I model the process of creating a cladogram, capture the steps in the left-hand column of the space provided below. • Capture the explanation of these steps and additional notes in the right-hand column. • Record the cladogram in the space indicated. • Prepare to answer the cladogram analysis questions to check your mastery of this process and the content underlying these principles Steps to Building a Cladogram Vascular Tissue Flowers Seeds Mosses (bryophytes) 0 0 0 Pine Trees (gymnosperms) 1 0 1 Flowering Plants (angiosperms 1 1 1 Ferns (pteridophytes) 1 0 0 Total 3 1 2 Organisms 1. Identify Outgroup • Find the species that had none of these features • This will be the outer branch – it has no known descendents 2. Draw Outgroup • Select a point to the left of the page Steps to Building a Cladogram Mosses Bryophytes Steps to Building a Cladogram Vascular Tissue Flowers Seeds Mosses (bryophytes) 0 0 0 Pine Trees (gymnosperms) 1 0 1 Flowering Plants (angiosperms 1 1 1 Ferns (pteridophytes) 1 0 0 Total 3 1 2 Organisms 3. ID Groups of lineages that share a derived character • We hypothesize that they form a clade • We don’t consider ancestral traits Steps to Building a Cladogram Mosses Bryophytes Pine Trees Gymnosperms Flowering Plants Angiosperms Steps to Building a Cladogram Vascular Tissue Flowers Seeds Mosses (bryophytes) 0 0 0 Pine Trees (gymnosperms) 1 0 1 Flowering Plants (angiosperms 1 1 1 Ferns (pteridophytes) 1 0 0 Total 3 1 2 Organisms 3. ID Groups of lineages that share a derived character • We hypothesize that they form a clade • We don’t consider ancestral traits • Repeat above step until you have put all species onto your tree Steps to Building a Cladogram Mosses Bryophytes Ferns Pteridophytes Pine Trees Gymnosperms Flowering Plants Angiosperms Steps to Building a Cladogram Vascular Tissue Flowers Seeds Mosses (bryophytes) 0 0 0 Pine Trees (gymnosperms) 1 0 1 Flowering Plants (angiosperms 1 1 1 Ferns (pteridophytes) 1 0 0 Total 3 1 2 Organisms 4. Include Adaptations • Identify the traits that arose throughout the cladogram Steps to Building a Cladogram Mosses Bryophytes Ferns Pteridophytes Pine Trees Gymnosperms Flowering Plants Flowers Angiosperms Steps to Building a Cladogram Vascular Tissue Flowers Seeds Mosses (bryophytes) 0 0 0 Pine Trees (gymnosperms) 1 0 1 Flowering Plants (angiosperms 1 1 1 Ferns (pteridophytes) 1 0 0 Total 3 1 2 Organisms 4. Include Adaptations • Identify the traits that arose throughout the cladogram Steps to Building a Cladogram Mosses Bryophytes Ferns Pteridophytes Pine Trees Gymnosperms Seeds Flowering Plants Flowers Angiosperms Steps to Building a Cladogram Vascular Tissue Flowers Seeds Mosses (bryophytes) 0 0 0 Pine Trees (gymnosperms) 1 0 1 Flowering Plants (angiosperms 1 1 1 Ferns (pteridophytes) 1 0 0 Total 3 1 2 Organisms 4. Include Adaptations • Identify the traits that arose throughout the cladogram Steps to Building a Cladogram Mosses Bryophytes Ferns Pteridophytes Pine Trees Vascular Tissue Gymnosperms Seeds Flowering Plants Flowers Angiosperms Paired Practice Directions • Work with your peers at your table and use the steps described above to create a cladogram for the data provided below. • As you work, annotate the data table provided to illustrate the steps being used. • Record the cladogram in the space indicated on page 4. • When you finish, begin answering the cladogram analysis questions without any instruction from me. These questions are designed to facilitate your analysis of the cladogram and to check your understanding of the underlying principles. Paired Practice Vertebra Bony Skeleton Four Limbs Amniotic Egg Hair Post-Orbital Fenestrae Lancelet 0 0 0 0 0 0 Sharks 1 0 0 0 0 0 Ray-Finned Fish 1 1 0 0 0 0 Amphibians 1 1 1 0 0 0 Primates 1 1 1 1 1 0 1 1 1 1 1 0 1 1 1 1 0 1 1 1 1 1 0 1 Organisms Rodents and Rabbits Crocodiles and Relatives Dinosaurs and Birds Paired Practice Solution Sharks Ray-Finned Fish Vertebra Amphibians Bony Skeleton Primates Four Limbs Hair Amniotic Egg Rodents & Rabbits Crocodiles Post-Orbital Fenestrae Dinosaurs & Birds Independent Practice Directions • Work silently and independently during the provided time to create a cladogram for the data provided below. Use the steps to creating a cladogram as you proceed. • As you work, annotate the data table provided to illustrate the steps being used. • Record the cladogram in the space indicated on page 6. • When you finish, begin answering the cladogram analysis questions without any instruction from me. These questions are designed to facilitate your analysis of the cladogram and to check your understanding of the underlying principles