1. Evidence for Evolution
15.1 Part 2

2. Evidence for Evolution
Adaptation = any variation that aids an organism’s chances for survival

3. Evidence for Evolution
Structural adaptations arise over many generations

4. Evidence for Evolution
Structural adaptations arise over many generations
Mimicry allows one species to look like another

5. Evidence for Evolution
Structural adaptations arise over many generations
Mimicry allows one species to look like another
Camouflage allows species to blend with surroundings

6. Evidence for Evolution
Physiological adaptations = changes in metabolic processes
Bacteria become resistant to antibiotics

7. Evidence for Evolution
Fossils = record of early life and evolutionary history

8. Evidence for Evolution
Fossils
Anatomy
Homologous structures = common evolutionary origin

9. Evidence for Evolution
Fossils
Anatomy
Homologous structures = common evolutionary origin
Analagous structures = do not have common evolutionary origin but are similar in function

10. Evidence for Evolution
Fossils
Anatomy
Homologous structures = common evolutionary origin
Analagous structures = do not have common origin but are similar in function
Vestigial structures = no function in present, but was useful to ancestor

11. Evidence for Evolution
Fossils
Anatomy
Homologous structures
Analagous structures
Vestigial structures
Embryology
Embryo=earliest stage of growth & development
Gill slits

12. Evidence for Evolution
Fossils
Anatomy
Homologous structures
Analagous structures
Vestigial structures
Embryology
Biochemistry
RNA and DNA