1. Eoc Catalyst #2

2. Announcements Make up work by THURSDAY
If you did not see your Unit 6 test grade on Monday, you need to ask me about it!!! It is going on your report card!!!!

3. Review Convergent evolution Divergent evolution Evolution
Natural selection
Darwin’s finches

4. OBJECTIVES
SWBAT identify the various forms of evidence supporting evolution (fossils, homologous structures, vestigial structures, DNA)
SWBAT explain how homologous structures demonstrate common ancestry (relatedness) and support evolutionary theory
SWBAT identify examples of vestigial structures and explain how vestigial structures provide evidence supporting evolution

5. Evidence for Evolution
Adaptations
Fossils
Anatomy
Embryology
Biochemistry
Vestigial structures

6. 1. Adaptations
-An adaptation is a change in an organism that allows them to survive better in their environment.
Examples of Adaptations:
Camouflage-allows an organism to blend in with your environment
Mimicry-allows an organism to look like another, more dangerous creature.

7. Camouflage

8. Mimicry

9. 2. Fossils
-Fossils are remains of long-dead organisms.

10. 2. Fossils Camel Evolution
-Fossils are evidence for evolution because they give a record of how organisms have changed over a long period of time.
Camel Evolution
Paleocene
65 million
years ago
Eocene
54 million
years ago
Oligocene
33 million
years ago
Miocene
23 million
years ago
Age
Present
Organism
Skull and
teeth
Limb
bones

11. 3. Anatomy -Anatomy is study of the way our bodies are put together.
-Anatomy is evidence for evolution because it shows how the structures of organisms have changed over time.

12. 3. Anatomy
-Structures in an organisms body that evolved from the same ancestor are called homologous structures.
Homologous structures can be similar in the way they are put together, in function (what they do), or in both.
Crocodile
forelimb
Whale
forelimb
Bird
wing

13. 3. Anatomy
-Analogous structures have the same function but evolved from different places.
-Analogous structures are also evidence for evolution because they show that two organisms that came from different ancestors, when placed under the same environmental pressures can evolve the same adaptations.

14. Example of an Analogous Structure:

15. 4. Embryology -An embryo is the earliest form of a baby.
-Embryos give evidence for evolution because many different kinds of organisms have embryos that look alike, suggesting that they all evolved from the same place.
Pharyngeal
pouches
Pharyngeal
pouches
Tail
Tail
Fish
Reptile
Bird
Mammal

16. 5. Biochemistry
-Biochemistry is the study of small molecules such as DNA.
-Biochemistry provides evidence for evolution because all organisms use DNA, RNA and ATP which shows that they all came from the same ancestor.

17. 6. Vestigial Structures
A vestigial structure is a structure that has reduced function in an organism.
Examples:
Kiwi wings
Appendix
Snake pelvis
Human tailbone

18. CFU Questions What are analogous structures?
How are fossils evidence of evolution?
True or False. Some organisms do not use DNA.
Give an example of a vestigial structure in a human.
What is a type of camouflage?
Why is embryology evidence for evolution?
What is the difference between analogous and homologous structures?
Define evolution.