- Learn about what a cladogram is, how to interpret a cladogram and how to build one based on derived charater traits of given organisms.
- to be able to make inferences about extinct organisms using cladograms.
- 1st complete the pre activity questionnaire.
- Next, go to the following site to learn more (click on "student start" to begin tutorial):
- Complete the tutorial -folders 1-4 (fill in date table for last activity)
- Did T. rex have an amniotic egg?
- Was T. rex warm-blooded or cold-blooded?
- Could T. rex have had feathers?
- Did T. rex have color vision?
- How many chambers were there in T. rex's heart?
- Did T. rex sing to its offspring?
Next visit the following site to learn about flight ;)
“The Evolution of Flight in Birds”
Go through the tutorial, at the end of the tutorial following the following procedures:
1) Brainstorm with your teammates about what the data in each of the cladograms and the Feature Table
suggest about how and when flight evolved in the dinosaur lineage. Make sure that you consider the following:
• Which features are associated with flight? Which are absolutely essential for flight?
• When did each of these features first appear in the fossil record?
• Did these features evolve for flight or did they originally serve other functions?
• What was “necessary” for flight to evolve?
2) Based on this evidence at hand, develop a hypothesis about the evolution of flight. If possible, this hypothesis should describe both the “how” and the “when.”
3) Your hypothesis must be well supported.
- a. Consider the information in all of the cladograms.
- b. Use direct evidence to support inferences.
- c. Suggest other evidence you could look for to support your hypothesis.
- d. Suggest other evidence you could look for to disprove your hypothesis.
Homework due Thursday- Getting Started- pg 43 1-3
Step 1 (page 45) Form an initial hypothesis as to where you believe the fossil specimen should be placed on the cladogram based on the morphological observations you made earlier. Draw your hypothesis on Figure 4. Review procedure for using BLAST program. Be ready to quickly migrate to the computer lab on Thursday.
Tree Thinking- Case study - Parts I-III- Due March 29
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