1. SURVIVAL OF THE FITTEST
Natural Selection
SURVIVAL OF THE FITTEST

2. Mutation and Recombination
Non-random
Random
 Natural Selection
 Genetic Drift
Gene Flow
Mutation and Recombination

3. NATURAL SELECTION- a process by which individuals have inherited beneficial adaptations and show differential reproductive success.

4. Natural Selection works on populations, NOT individuals!!!

5. Natural Selection- Survival of the fittest
Based on 4 conditions:
Variation – populations must exhibit phenotypic variability. Differences must exist between individuals.
Some variations are favorable = adaptations
Some variations are more favorable
Some variations are less favorable.

6. Thought questions 1 and 2

7. Based on 4 conditions (Continued)
Overproduction- More offspring are born than can survive

8. Based on 4 conditions (Continued)
Heritability – parents must be able to pass traits to offspring

9. Thought question #3

10. Based on 4 conditions (Continued)
Fitness –Organism’s ability to survive and reproduce relative to other organisms in a given environment.
Differential reproductive success- some organisms reproduce better than others

11. Thought Question #4 & #5

12. How it works: Favorable traits are “selected for”
Individuals with favorable traits are more likely to survive and reproduce
Unfavorable traits are “selected against”
Individuals with unfavorable traits are more likely to die off
ex. Starve or be eaten by predators) and therefore will not reproduce.

13. Removal of unfavorable traits (alleles) and an increase in favorable traits (alleles) cause change in population over time = Evolution

14. Thought Question #6