Evolution in Action

1
Evolution in Action

• Chapter 15 Section 3

2
Convergent Evolution

• 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.
• 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
Artificial Selection

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

9
Coevolution

• When two species influence each others 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.

10
Coevolution

• Video