1. Evidence For Evolution

2. Evidence for evolution: Anatomy
Topic
Evidence
Importance
Anatomy
Vestigial Structures - Structures that have no or little use
Closely related species have fully functional versions of vestigial structures

5. Evidence for evolution: Anatomy
Topic
Evidence
Importance
Anatomy
Homologous structures
Similar anatomy suggests relationship

8. Evidence for evolution: Fossils
Topic
Evidence
Importance
Fossils
Extinct organisms
Life has not remained consistent over time

10. Evidence for evolution: Fossils
Topic
Evidence
Importance
Fossils
Transitional fossils
A fossil that shows traits of both ancestor and descendents

11. Archaeopteryx

12. Microraptor
Discovered by Xu Xing in 2000

14. Evidence for evolution: Fossils
Topic
Evidence
Importance
Genetics
Similar DNA sequence
Two organisms with similar DNA sequences are probably closely related

15. Human DNA is 98.8% similar to chimpanzee

16. But only 93.4% similar to baboons
Unlike humans and chimps, baboons have tails

17. Mechanism for evolution
Natural Selection
Darwin’s idea
Mechanism for evolution

18. Individuals vary in traits
4 Principles
Individuals vary in traits
Not everyone can survive (struggle for existance)

19. Differences in traits can affect your ability to survive
4 Principles Cont.
Differences in traits can affect your ability to survive
Differences can be passed from parent to offspring (Heredity)

20. Traits Vary
Peppered moths come in black and white (variation)

21. Not Everyone Survives
Birds eat moths (struggle for existence)

22. Differences Affect Survival
Black moths are harder to see on black bark, and thus more survive

23. Differences Are Passed From Parent to Offspring
Because more black moths survive, they produce more black offspring B BB b Bb

24. Summary Black moths survive better, thus produce more offspring
Future generations will have more black moths
Eventually the white moth may go extinct