Transcript EVOLUTION IN ACTION

15-3 NOTES:
EVOLUTION IN
ACTION
PP. 308-311
EVOLUTION
DEFINED…
Evolution of a population is due
to environment and the
interaction of other species
TYPES OF EVOLUTION
Convergent evolution:
•Organisms with very
different ancestors become
more alike due to a common
environment
TYPES OF EVOLUTION
Convergent evolution:
•Organisms with very
different ancestors become
more alike due to a common
environment
•compare analogous
structures: same functions
but different development
Ex: shark and dolphin, bird and insect wing
TYPES OF EVOLUTION
Divergent evolution:
-Populations become more and more
dissimilar to adapt to the environment
-They share a recent common ancestor
TYPES OF EVOLUTION
Divergent evolution:
-Populations become more and more
dissimilar to adapt to the environment
-They share a recent common ancestor
-compare homologous structures: similar
body part but may have different functions
Adaptive Radiation: Population undergoes
divergent evolution until it fills all areas of the
environment
Mammals went through
adaptive radiation during the
tertiary period. When the
dinosaurs died out, mammals
evolved to fit niches once
used by dinosaurs
Darwin’s Finches are an
example of adaptive radiation.
They can be found in all areas
of the island: the ground, in
bushes, in all levels of the
trees.
COEVOLUTION
• When two species
each evolve in
response to each
other over a long
period of time.
• This leads to a
close relationship
• EX: Rough-skinned newt and garter snake
• Newt evolved to produce neurotoxins then the
snake evolved resistance to this toxin through
genetic mutations.
Birds and
flowers,
Humans and
bacteria are
other examples
CLASSWORK
“Types of Evolution Tree Map”
Vocabulary 4-squares
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Convergent evolution
Divergent evolution
Artificial selection
Coevolution
Types of Evolution
Convergent
Evolution
Divergent
Evolution
Definition
Definition
Example
Example
4-SQUARE MODEL
Definition
Example
Picture
Word
Related Words (3)