Transcript Cladograms
185 Cladograms 3/3/16 EQ: How do we classify organisms into groups? Starter: What do you think a cladogram or phylogenetic tree is? Application/Connection/Exit: Activity: Turn in when Complete Cladograms 186 3/3/16 Practice: Write your own notes March 3, 2016 AGENDA B.8A Define taxonomy and recognize the importance of a standardized taxonomic system to the scientific community ELPS. c1C, c1E 1 Starter 2. Notes 3. Activity Date Table of Contents Lecture/ Activity/ Lab Page 1/28 Dihybrid cross III 153-154 2/1 Mechanisms of Evolution 155-156 2/2 Darwin and Evolution 157-158 2/3 Evolution Reading 159-160 2/4 Adaptation Lab 161-162 2/5 Peppered Moth Lab 163-164 2/8 Reproductive success and Natural Selection 165-166 2/9 Natural Selection Foldable 167-168 2/11 Ordering Fossils Activity 169-170 2/12 Evidence of Fossils 171-172 2/16-17 Evidence of Evolution Lab 173-174 2/18 Test Review 175-176 2/23-24 Classification 177-178 2/25 Dichotomous Keys 179-180 2/26-29 Dichotomous Key Project 181-182 3/1-2 Dichotomous Key Station Lab 183-184 3/3 Cladograms 185-186 Evolutionary Classification • Phylogeny = the study of evolutionary relationships • Biologists now group organisms into categories that represent evolutionary descent (and not just physical similarities) How would you classify a hyena? Would you group it with cats or dogs? Photo credit flickr: ibeatty Derived Characters Characteristics that appear more recently in a group but are not seen in older organisms Derived characters are used to construct a CLADOGRAM • a diagram that shows evolutionary relationships Cladograms A diagram that shows evolutionary relationships HOW TO BUILD A CLADOGRAM Watch this animation on how to build a cladogram http://ccl.northwestern.edu/simevolution/obon u/cladograms/Open-This-File.swf Identifying Unknown Organisms • When biologists do field studies, they often encounter new specimens that they would need to identify • FIELD GUIDES often contain pictures for referencing organisms Dichotomous Keys What am I?? • A step-by-step guide to help identify an organism • Follows a series of choices that lead you to the organism’s name Photo Credit: Sam? (Flickr) 1. Has green colored body ......go to 2 Has purple colored body ..... go to 4 2. Has 4 legs .....go to 3 Has 8 legs .......... Deerus octagis 3. Has a tail ........ Deerus pestis Does not have a tail ..... Deerus magnus 4. Has a pointy hump ...... Deerus humpis Does not have a pointy hump.....go to 5 5. Has ears .........Deerus purplinis Does not have ears ......Deerus deafus Check for Understanding • A diagram that shows an evolutionary relationship is a ________________________ Cladogram • A characteristic that appears only in recent members is called a ________________ Derived character Characteristics • The study of evolutionary relationships is called Phylogeny __________________________ • A system to find the name of an unknown Dichotomous organism is a _______________________ key 185 Cladograms 3/3/16 EQ: How do we classify organisms into groups? Starter: What do you think a cladogram or phylogenetic tree is? Application/Connection/Exit: Activity: Turn in when Complete Cladograms 186 3/3/16 Practice: Write your own notes