1. Evidence for Evolution

2. Major Evidence for Evolution
Fossil record
Homologous structures
Vestigial structures
Biochemical evidence
Embryological development

3. Fossil Record What does the Fossil Record tell us about organisms?
Looks (size, shape, etc.)
Where or how they lived
What other organisms they lived with

4. What time period they lived in (based on location in rock layers)
What order living things came in (based on location in rock layers)
Transitional forms
Organisms that were intermediate (between) two other major organisms

5. Example: Horse

7. Homologous Structures-bodily structures that are similar in structure, but different in function, due to sharing a common ancestor

8. 2. Homologous Structures

9. Homologous Structures

10. Analogous Structures
Analogous structures- bodily structures that are similar in function, but not in structure. NOT EVIDENCE OF COMMON ANCESTRY.
Example: wings of a bee and wings of a bird

12. Vestigial Structures
Structures that serve no function but useful structures in earlier ancestors
Examples: Ear muscles
Human tailbone
Appendix

15. Vestigial Organs

16. Embryological Development
Embryo- fertilized egg that will/is in the process of growing into a new individual
Closely related organisms go through similar developmental stages early in development
All vertebrates have gill pouches sometime during their early development

18. Molecular/Biochemical Evidence
DNA used to translate nucleotide sequences into amino acid is essentially the same in all organisms
Proteins in all organisms are composed of the same set of 20 amino acids
Powerful argument in favor of the common descent of the most diverse organisms.