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Transcript
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
Speciation
 Speciation is the
formation of a
___________
species.
 For speciation to
occur a population
must
___________ and
then be
reproductively
___________.
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
____________
____________ or
some
other ecological
opportunity
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Convergent Evolution
 ____________
species evolve
____________
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
____________ the evolution of the other
species.
 Associated with ____________
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance
Rate of Speciation
 Evolution proceeds in small, gradual steps
according to a theory called ____________.
 ____________ ____________ explains rapid
spurts of genetic change causing species to
diverge quickly.
Chapter 15
Evolution
15.3 Natural Selection-Speciation-Resistance