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Biodiversity, Ancestry, & Rate of Evolution (15.3)
State Standard
SB5B. Explain the history of life in terms
of biodiversity, ancestry, and the rates of
evolution.
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Speciation
 Speciation is the
formation of a new
species.
 For speciation to
occur a population
must diverge and
then be
reproductively
isolated.
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Adaptive Radiation – AKA Divergent Evolution/Speciation
 Can occur in a relatively short time when one species
gives rise to
many different
species in
response to the
creation of new
habitat or some
other ecological
opportunity
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Convergent Evolution
 Unrelated
species evolve
similar traits
because of
similar
environmental
pressures.
Chapter 15
Evolution
15.3 Natural Selection-SpeciationResistance
Coevolution
 The relationship between two species might
be so close that the evolution of one species
affects the evolution of the other species.
 Associated with mutualism
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Rate of Speciation
 Evolution proceeds in small, gradual steps
according to a theory called gradualism.
 Punctuated equilibrium explains rapid spurts
of genetic change causing species to diverge
quickly.
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Chapter 15
Evolution
15.3 Formative
Questions
Which evolutionary pattern is
represented by the similarities
between these two organisms
that live on separate continents?
0%
B
A
0%
A
B
C
D
0%
0%
D
1.
2.
3.
4.
C
A. coevolution
B. convergent evolution
C. directional evolution
D. divergent evolution
Chapter 15
Evolution
Chapter Assessment
Questions
The divergent evolution
of these cichlid fish is
an example of what
type of speciation?
0%
B
A
0%
A
B
C
D
0%
0%
D
1.
2.
3.
4.
C
A. coevolution
B. mutation
C. adaptive radiation
D. convergent evolution
Chapter 15
Evolution
Chapter Assessment
Questions
What tempo of evolution
does this model represent?
0%
B
A
0%
A
B
C
D
0%
0%
D
1.
2.
3.
4.
C
A. gradual
B. elevated
C. sequential
D. punctuated