Download Speciation through Isolation

Speciation Through Isolation
11.5
Student Self Assessment
1. I barely know what the subject is. I need
significant help.
2. I think I’m starting to get it, but I need some
clarification. I do make some mistakes.
3. I have a strong grasp of the subject. I make few
mistakes.
4. I understand this as well as any other student in
this classroom. I can help others.
Reproductive isolation occurs when members of
different populations can no longer mate successfully
with one another.
The rise of 2 or more species from one existing
species is called speciation.
Behavioral isolation is isolation caused by differences
in courtship or mating behaviors.
Geographic isolation involves physical barriers that
divide a population into 2 or more groups.
Temporal isolation exist when timing prevents
reproduction between populations.
Patterns in Evolutions
11.6
Mutations are random, but natural selection is not
random!
Evolution towards similar characteristics in different
species is called convergent evolution.
When closely related species evolve in different
directions they become increasingly different through
divergent evolution.
Coevolution is the process in which 2 or more species
evolve in response to changes in each other.
Evolutionary arms race
When a species is unable to adapt to a change in its
environment this leads to its elimination from Earth –
extinction.
Equilibrium = Balance
Puncture = to disturb by piercing
Species creation (speciation) occurs suddenly and is
followed by long periods of little evolutionary change.
This is known as punctuated equilibrium.
The diversification of an ancestral species into many
descendent species is known as adaptive radiation.
Student Self Assessment
1. I barely know what the subject is. I need
significant help.
2. I think I’m starting to get it, but I need some
clarification. I do make some mistakes.
3. I have a strong grasp of the subject. I make few
mistakes.
4. I understand this as well as any other student in
this classroom. I can help others.