1. Evolution

2. Evolution:
The generation-to-generation change in the proportion of different inherited genes in a population that accounts for all of the changes that have transformed life over an immense amount of time

3. Oh dear, natural selection is at it again!
Gary Larsen

4. Evidence of Evolution Evidence of Evolution
Geographic Distribution of Organisms
Similar animals in different locations are products of different lines of evolutionary descent.

5. Embryology
Similar early development

6. Vestigial Structures
Some organs & structures become unnecessary as species evolve
Tail bone
Ear muscles
Wisdom teeth
Tonsils

7. Evidence of Evolution
Fossil

8. Fossils

9. Transitional Fossils

10. DNA & Proteins The code of life is universal
Similarities and differences help put together a picture of the evolutionary family tree

11. Homologous Body Structures
Section 15-3
Homologous Body Structures
Turtle
Alligator
Bird
Mammals
Typical primitive fish

12. Homologous Body Structures

13. Vertebrate Hemoglobin

14. Mechanisms of Evolution
Mutations
Changes in DNA that are not fatal or harmful create variation within species that results in differential survival of individuals – “survival of the fittest”

15. Mechanisms of Evolution
Natural Selection
The process by which individuals with beneficial inherited characteristics (adaptations) survive better and therefore reproduce more than other members of the species

16. Requirements for Natural Selection
Variation within a species of inheritable characteristics – beneficial characteristics are called adaptations
Overproduction of offspring causing competition for resources
Differential survival and reproduction of individuals over many generations