1. Mind Stretcher

2. What is the Evidence for Evolution. https://youtu
What is the Evidence for Evolution? (11 min.)

3. Write definition of Evolution on the left of your new big notes sheet!
What is EVOLUTION?
The PROCESS in which populations gradually change over long periods of time
Write definition of Evolution on the left of your new big notes sheet!

4. Evidence for Evolution Includes:
HOMOLOGOUS STRUCTURES
EMBRYOLOGY
FOSSIL RECORD
DNA & TRAITS

5. Comparative Anatomy: Homologous Structures
In everyday life, people look like one another for different reasons. Two sisters, for example, might look alike because they both inherited brown eyes and black hair from their father. On the other hand, two people attending an Elvis impersonators’ convention may look alike because they are both wearing rhinestone studded suits and long sideburns. The similarity between the sisters is inherited, but the similarity between the Elvis impersonators is not.
It works the same way in Biology. Some traits shared by two living things were inherited from their ancestor, and some similarities evolved in other ways. (derived characteristics)

6. Homologous Structures:
Similar structures derived from a common ancestor.
HUMAN, CAT, WHALE, BAT = Similar Bones!!
Homologous Structures (link to activity)

7. Which limb is NOT homologous? Why?A
Human
Lizard
Octopus
Which limb is NOT homologous? Why? B
Bird
Whale
Grasshopper
Lizard
Human

8. Embryology
During the very early stages of life (in the womb), many organisms go through similar stages of development.

9. Fossil Record:
A “timeline of life” that organizes fossils by their estimated ages and physical similarities.
Used to determine relationships between extinct and living organisms.

10. What is a fossil?
Fossils are the remains or imprints of once-living organisms found in layers of rock. (mostly found in sedimentary rock)
Paleontologists work among some of the hundreds of fossilized skeletons at Nebraska's Ashfall Fossil Beds.

11. Sedimentary Rock
Formed from deposited sediments, as the sediments build up, pressure increases, pressure squeezes the bottom layers and they form rocks. (lithification)
Laid down in layers or beds, younger beds are above the older beds
Younger
Older

12. How do we get a fossil?
Fossils are RARE!

13. Using Fossils to Estimate Age
By identifying which layer of sediment the fossil is found in, we can estimate the age of the organism.
Label the “OLDEST” and “MOST RECENT” layers!!
*Identify layer of fossil = estimate age!
REVIEW: The diagram below shows a geologic cross section. Which rock layer most likely contains fossils of the most recently evolved organisms?
A 1
B 2
C 3
D 4
MOST RECENT
OLDEST

14. Additional Evidence: DNA
DNA: Scientists can compare DNA and find similarities among traits
These similarities are used to show common ancestors among species (Ex: Whales & Hippos)

15. Evidence for Evolution Summary:
HOMOLOGOUS STRUCTURES
EMBRYOLOGY
FOSSIL RECORD
DNA & TRAITS

16. Ways to Show Evolutionary Relationships:
Branching Tree Diagrams
“Tree of Life”

17. BRANCHING TREE DIAGRAM- diagram/model showing evolutionary relationships through shared characteristics

18. Which species’ has a jaw and lungs, but does not have claws or nails?

19. Tree of Life - model showing all known species on Earth connected to common ancestors (Incomplete… new species always being discovered)

20. Tree of Life Video clip (4 min. closing)