March 18, 2013

1. (A Day: Per. 1) Agenda Levels of Classification Branching Trees (Notes) Branching Trees WS HW: Study Guide March 18, 2013

2. (A Day: Per. 3 & 4) Agenda DSJ #33 Branching Trees (Notes) Branching Trees WS DSR #33 HW: Study Guide March 18, 2013

3. (B Day) Agenda DSJ #33 Branching Trees (Notes) Branching Trees WS DSR #33 HW: Study Guide March 19, 2013

4. Science Notebook – 7B Prompt: Analyze the table of plant characteristics. What do you notice about moss? What about the apple tree? What order could you put them in from simplest to most complex? Why? Explain your answers in 5 sentences or more. DSJ #33

5. Branching trees

6. Learning Objective Explain how a branching tree diagram shows evolutionary relationships.

7. Introduction • 1. Groups of organisms with similar charateristics may be descended from a common ancestor.

8. Introduction • 1. Groups of organisms with similar charateristics may be descended from a common ancestor. • 2. The more similar the two groups are, the more recent the common ancestor probably is.

9. Introduction • 3. Branching trees show probable evolutionary relationships among organisms. It also shows the order in which specific characteristics may have evolved.

10. Shared Derived Characteristics • 4. A branching tree diagram shows evolutionary relationships by grouping organisms according to shared derived characteristics. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

11. Shared Derived Characteristics • 5. A shared derived characteristic is usually a homologous structure, such as a backbone, that is shared by all organisms in a group.

12. Shared Derived Characteristics • 5. A shared derived characteristic is usually a homologous structure, such as a backbone, that is shared by all organisms in a group. • 6. On a branching tree diagram, all organisms above the label have the trait. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

13. Shared Derived Characteristics • A branching tree has groups within groups. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

14. Shared Derived Characteristics • A branching tree has groups within groups. • 7. Species within any group are more closely related to one another than to species not in the group. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

15. Shared Derived Characteristics • 8. Characteristics that appear lower on a branching tree probably developed before characteristics higher on the tree. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

16. Constructing a Branching Tree • 9. A branching tree diagram begins with a common ancestor and ends with the organism or group with the greatest number of shared derived characteristics. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

17. Constructing a Branching Tree • 10. Branching tree diagrams can sometimes show fossils as well as living organisms. Reptiles Amphibians Fishes Egg with shell Invertebrates Four limbs Backbone Ancestor of animals

18. **Please remember to use only TWO drops of glue!!** If everyone uses only TWO drops, a lot of glue is saved over time…. 6A – Branching Trees (Notes) 7A – Study Guide: Classifying Organisms Glue in SNB

19. Science Notebook – 7B (Under DSJ #33) Prompt: What does a branching tree diagram show? What does it mean when an organism is above a label on the diagram? What is at the beginning of a branching tree diagram? DSR #33