Types of evolution notes

1. TYPES OF EVOLUTION NOTES UNIT 8 DAY 4

2. 1. Coevolution Coevolution—two species evolve together due to their close relationship. When one evolves, the other evolves too! Examples: birds/bees and flowers for pollination, predators/prey

3. 2. Divergent Evolution Divergent evolution—species with same ancestor become more and more different until they are different species! DIFFERENT ENVIRONMENTS Example: Finches on the Galapagos Islands evolved into many different species to eat different foods. Remember what a species is?

4. 3. Convergent Evolution Convergent evolution—species with different ancestors becoming more similar SAME ENVIRONMENT Example: Dolphins and fish have very different ancestors (mammals vs. fish), but both have evolved flippers because they live in the sea.

5. CONVERGENT: same environment DIVERGENT: different environment COEVOLUTION: predator/prey

6. What is a Phylogenetic Tree? Shows evolutionary relationship among organisms As you go down the tree, you go back in time to a common ancestor Branching out means natural selection caused speciation

7. How do I r ead Phylogenetic Trees? The closer two lines are to each other, the more closely related the species The further away, the more distantly related What is the closest related species to species D in the 1 st tree? What species is the most different from species D in the 2 nd tree? What is the closest ancestor to species A in the 3 rd tree?