1. Evolution in Action Chapter 15 Section 3

2. Convergent Evolution Different species become more similar. Different species become more similar. –Example #1: Birds and bats –Example #2: Dolphins and sharks

3. Divergent Evolution (Adaptive Radiation) Similar species become more different. Similar species become more different. –Example: The kit fox and red fox –Example: Lions and tigers –Example: Turtles and tortoises

4. Convergent or Divergent Evolution? Divergent Closely related species evolve in different directions

5. Convergent or Divergent Evolution? Convergent Unrelated species evolve similar characteristics

6. Convergent or Divergent Evolution? Divergent Closely related species evolve in different directions

7. Convergent or Divergent Evolution? Convergent Unrelated species evolve similar characteristics

8. Humans select individuals with the traits they want Humans select individuals with the traits they want Then breed them to produce more individuals with those traits Then breed them to produce more individuals with those traits Speeds up the process of divergent evolution Speeds up the process of divergent evolution Artificial Selection

9. When two species influence each other’s evolution When two species influence each other’s evolution –Example: Snails & Crabs –Example: Plants & their pollinators –Example: Shells of murex snails evolved to become thicker and spinier. In response, crabs that eat snails evolved more powerful claws strong enough to crack the snails’ shells. Coevolution

10. Video Video Video Coevolution