1. Aim: What are the Patterns of Evolution?
Hw: Read 439 – 441
Q 1-4

2. Mass Extinction
Huge numbers of species disappear around the same time.
What are some of the causes of a mass extinction?

3. Adaptive Radiation
A single ancestral species evolves into many daughter species

4. Convergent Evolution
Unrelated organisms come to resemble each other.

5. Co-evolution Two species evolve in response to changes in each other.
For example: flower and insect.

6. How fast does evolution occur?
Gradualism
Evolution occurs slowly over time with gradual changes over the years
Punctuated Equilibrium
Organisms remain the same for long periods of time. However, they are interrupted by periods of rapid change.