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