1. Aim: How does adaptive variation lead to the survival of an organism?

2. How is Kevin Costner different from everybody else in Water World?
He had webbed feet and gills
ADAPTIVE VARIATION

3. DIFFERENCES (in structure and or behavior) within a population
Variation1
DIFFERENCES (in structure and or behavior) within a population

4. What produces variations?2
Sexual reproduction
recombination of genes (fertilization)
Meiosis
Crossing over

5. What produces variations?
Independent assortment – different gametes made by one parent
2. Mutations

6. Why are variations important to a population?3
Variation in a species increases the chances that some members will survive a significant change in the environment.
Why is this important…?

7. For example: The peppered moth

8. Adaptation
A variation (trait) that allows an organism to survive in it’s environment

9. Adaptive Variation5
A variation (trait you’re born with) that allows you to survive a changing environment

10. Types of Environmental Changes
Climate
Food Sources / Availability
Predators
Available oxygen (in ponds, lakes, bays, rivers)
Habitat / shelter

11. What would happen to a population (with variation) if the environment changed?6
Those who had an adaptive variation would survive (& reproduce). This may lead to ….
EVOLUTION

12. What would happen to a population that did not have variation?7
If they don’t posses a trait that allows them to adapt to a changing environment, they will decrease in population (more die, also reproduce less which may lead to….
EXTINCTION

13. How does this affect evolution?
Evolution defined as:
The process by which species change over time.
Present day species are related to ancient species.

14. Summary Questions:
What are the two driving forces behind evolution? ______________________
2)How do variations in traits within a species occur?
3)In your own words, define what an adaptive variation is?
Reproductive Variation & Environment
Sexual Reproduction & Genetic Mutations

16. Controversial- hunting or climatic changes, that’s what happened to its ancestor, the southern mammoth.