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Figure 18.1
Page 292
Slide 1
Grown on land
Grown in water
Figure 18.2
Page 294
Slide 2
Simplified diagram of genetic divergence
time A
time B
time C
time D
daughter
species
parent species
time
Figure 18.3
Page 294
Slide 3
1
A few individuals of a
species on the mainland
reach isolated island 1.
Speciation follows genetic
divergence in a new habitat.
Later in time, a few
1
individuals of the new
species colonize nearby
island 2. In this new
habitat, speciation follows
genetic divergence.
Speciation may also
follow colonization of
islands 3 and 4. And it
may follow invasion of
island by genetically
different descendants
of the ancestral species.
3
2
4
2
1
3
2
4
Stepped Art
Figure 18.6
Page 297
Slide 4
kona finch
extinct
kauai akialaoa
laysan
finch
amakihi
iiwi
akiapolaau
apapane
maui
parrotbill
fruit and seed eaters
insect and nectar eaters
FOUNDER SPECIES
Figure 18.7
Page 297
Slide 5
T. aestivum (one of the
common bread wheats)
Triticum monococcum
(einkorn)
T. tauschii
(a wild relative)
Unknown species
of wild wheat
14AA
X
14BB
14AB
T. turgidum
(wild emmer)
28AABB
X
14DD
42AABBDD
cross-fertilization, followed by a
spontaneous chromosome doubling
Figure 18.9
Page 299
Slide 6
Bullock’s oriole
Baltimore oriole
hybrid zone
Figure 18.10
Page 299
Slide 7
extinction
(branch
ended
before
present)
new species
branch point
(a time of
divergence,
speciation)
a single
lineage
branch point
(a time of
divergence,
speciation)
a new
species
a single
lineage
dashed line
(only sketchy
evidence of
presumed
evolutionary
relationship)
Figure 18.11
Page 300
Slide 8
Figure 18.12
Page 301
Slide 9