1. Processes of Speciation
Sections
11.5 and 11.6

2. Genetic Isolation
Whenever genetic information ceases to
transfer between two populations, they
are considered isolated

3. A mule is a
combination
between a horse
and a donkey.
While they can
produce
offspring, the
offspring are
infertile.
Reproductive Isolation
Isolation caused when members of different
populations can no longer produce offspring that
can survive and reproduce.

4. Behavioral Isolation
Isolation caused
by the
differences in
courtship and
mating
behaviors…reme
mber the birds of
paradise. They have bazaar courtship
rituals that are very
unique to different
species

5. Geographic
Isolation
Isolation due to
physical barriers
including rivers,
oceans , and
mountains…island
s are a great
example

6. Temporal Isolation
Isolation due to
the timing of
reproductive and
courtship
periods…temporal
is all about timing! These frog species mate
at different times
and may be the
reason for speciation

7. Patterns in Evolution
Evolution through the process of natural
selection is not random. Instead, it has
a direction based on environmental
factors.
Its important to distinguish that this does
not mean that there is intent in the
process!

8. Convergent Marine Marine
mammal fishes
Evolution (whales)
Evolution towards Swimming
Swimming
similar characteristics ability ability
among unrelated
Dorsal fin Dorsal Fin
species due to similar
environmental Broad flat
Broad flat
conditions tail tail
Sleek body Sleek body
shape shape

9. Convergent evolution
Whales Sharks

10. Convergent evolution
Bats Birds

11. Divergent Evolution
When closely related species evolve to
become more and more different over time
Ancestral
Bat
Vampire Fruit
Bat Bat

12. Divergent Evolution
Vampire Bat Fruit Bat
Click HERE to see Click HERE to See
video #1 video #2

13. Coevolution
The evolution of
two species in
response to each
other
Can be both These fish both
beneficial and benefit from this
competitive
relationship

14. Coevolution
Cheetah Gazelle
Click HERE to Click HERE to
watch video #1 watch video #2

15. Coevolution
In the case of the Gazelle and the
Cheetah, both are extremely fast in
order to survive.