Figure 22.0 Title page from The Origin of Species Figure 22.1 The historical context of Darwin’s life and ideas Figure 22.2 Fossils of trilobites, animals that lived in the seas hundreds of millions of years ago Figure 22.3 Formation of sedimentary rock and deposition of fossils from different time periods Figure 22.4 Strata of sedimentary rock at the Grand Canyon Figure 22.5 The Voyage of HMS Beagle Figure 22.6 Galápagos finches Figure 22.7 Descent with modification Figure 22.8 Overproduction of offspring Figure 22.9 A few of the color variations in a population of Asian lady beetles Figure 22.10 Camouflage as an example of evolutionary adaptation Figure 22.11a Artificial selection: cattle breeders of ancient Africa Figure 22.11b Artificial selection: diverse vegetables derived from wild mustard Figure 22.12 Evolution of insecticide resistance in insect populations Figure 22.13 Evolution of drug resistance in HIV Figure 22.14 Homologous structures: anatomical signs of descent with modification Table 22.1 Molecular Data and the Evolutionary Relationships of Vertebrates Figure 22.15 Different geographic regions, different mammalian “brands” Figure 22.16 The evolution of fruit fly (Drosophila) species on the Hawaiian archipelago Figure 22.17 A transitional fossil linking past and present Figure 22.18 Charles Darwin in 1859, the year The Origin of Species was published Figure 22.x1 Darwin as an ape Figure 22.x2 Georges Cuvier Figure 22.x3 Charles Lyell Figure 22.x4 Jean Baptiste Lamarck Figure 22.x5 Alfred Wallace Figure 23.0 Shells Figure 23.1 Individuals are selected, but populations evolve Figure 23.x1 Edaphic Races of Gaillardia pulchella Figure 23.2 Population distribution Figure 23.3a The Hardy-Weinberg theorem Figure 23.3b The Hardy-Weinberg theorem Figure 23.4 Genetic drift Figure 23.5 The bottleneck effect: an analogy Figure 23.5x Cheetahs, the bottleneck effect Figure 23.6 Gene flow and human evolution Figure 23.7 A nonheritable difference within a population Figure 23x2 Polymorphism Figure 23.8 Clinal variation in a plant Figure 23.9 Geographic variation between isolated populations of house mice Figure 23.10 Mapping malaria and the sickle-cell allele Figure 23.11 Frequency-dependent selection in a host-parasite relationship Figure 23.12 Modes of selection Figure 23.12x Normal and sickled cells Figure 23.13 Directional selection for beak size in a Galápagos population of the medium ground finch Figure 23.14 Diversifying selection in a finch population Figure 23.15 The two-fold disadvantage of sex Figure 23.16x1 Sexual selection and the evolution of male appearance Figure 23.16x2 Male peacock Figure 24.0 A Galápagos Islands tortoise Figure 24.2a The biological species concept is based on interfertility rather than physical similarity Figure 24.2b The biological species concept is based on interfertility rather than physical similarity Figure 24.3 Courtship ritual as a behavioral barrier between species Figure 24.5 A summary of reproductive barriers between closely related species Figure 24.1 Two patterns of speciation Figure 24.6 Two modes of speciation Figure 24.7 Allopatric speciation of squirrels in the Grand Canyon Figure 24.8 Has speciation occurred during geographic isolation? Figure 24.9 Ensatina eschscholtzii, a ring species Figure 24.10 Long-distance dispersal Figure 24.11 A model for adaptive radiation on island chains Figure 24.12 Evolution of reproductive isolation in lab populations of Drosophila Figure 24.13 Sympatric speciation by autopolyploidy in plants Figure 24.14a Botanist Hugo de Vries Figure 24.14b The new primrose species of botanist Hugo de Vries Figure 24.15 One mechanism for allopolyploid speciation in plants Figure 24.16 Mate choice in two species of Lake Victoria cichlids Figure 24.18 A range of eye complexity among mollusks Figure 24.17 Two models for the tempo of speciation Figure 24.19 Allometric growth Figure 24.20 Heterochrony and the evolution of salamander feet among closely related species Figure 24.21 Paedomorphosis Figure 24.22 Hox genes and the evolution of tetrapod limbs Figure 24.23 Hox mutations and the origin of vertebrates Figure 24.24 The branched evolution of horses Figure 25.1 A gallery of fossils Figure 25.1a Dinosaur National Monument Figure 25.1d Leaf impression Figure 25.1b Skulls of Australopithecus and Homo erectus Figure 25.1c Petrified trees Figure 25.1e Ammonite Figure 25.1f Dinosaur tracks Figure 25.1g Scorpion in amber Figure 25.1h Mammoth tusks Figure 25.1x1 Sedimentary deposit Figure 25.1x2 Barosaurus Table 25.1 The Geologic Time Scale Figure 25.2 Radiometric dating Figure 25.3x2 San Andreas fault Figure 25.4 The history of continental drift Figure 25.5 Diversity of life and periods of mass extinction Figure 25.6 Trauma for planet Earth and its Cretaceous life Figure 25.6x Chicxulub crater Figure 25.7 Hierarchical classification Figure 25.8 The connection between classification and phylogeny Unnumbered Figure (page 494) Cladograms Figure 25.9 Monophyletic versus paraphyletic and polyphyletic groups Figure 25.10 Convergent evolution and analogous structures Figure 25.13 Aligning segments of DNA Figure 25.11 Constructing a cladogram Figure 25.12 Cladistics and taxonomy Figure 25.14 Simplified versions of a four-species problem in phylogenetics Figure 25.15a Parsimony and molecular systematics Figure 25.15b Parsimony and molecular systematics (Layer 1) Figure 25.15b Parsimony and molecular systematics (Layer 2) Figure 25.15b Parsimony and molecular systematics (Layer 3) Figure 25.16 Parsimony and the analogy-versus-homology pitfall Figure 25.17 Dating the origin of HIV-1 M with a molecular clock Figure 25.18 Modern systematics is shaking some phylogenetic trees Figure 25.19 When did most major mammalian orders originate? Figure 26.1 Some major episodes in the history of life Figure 27.2 The three domains of life Table 27.2 A Comparison of the Three Domains of Life Figure 27.12 Contrasting hypotheses for the taxonomic distribution of photosynthesis among prokaryotes Figure 27.13 Some major groups of prokaryotes Figure 28.6 Traditional hypothesis for how the three domains of life are related Figure 28.7 An alternative hypothesis for how the three domains of life are related Figure 28.8 A tentative phylogeny of eukaryotes Figure 29.1 Some highlights of plant evolution Figure 30.4 Hypothetical phylogeny of the seed plants Figure 32.4 A traditional view of animal diversity based on body-plan grades Figure 32.1 Early embryonic development (Layer 1) Figure 32.1 Early embryonic development (Layer 2) Figure 32.1 Early embryonic development (Layer 3) Figure 32.2 A choanoflagellate colony Figure 32.3 One hypothesis for the origin of animals from a flagellated protist Figure 32.4 A traditional view of animal diversity based on body-plan grades Figure 32.5 Body symmetry Figure 32.6 Body plans of the bilateria Figure 32.7 A comparison of early development in protostomes and deuterostomes Figure 32.8 Animal phylogeny based on sequencing of SSU-rRNA Figure 32.9 A trochophore larva Figure 32.10 Ecdysis Figure 32.11 A lophophorate Figure 32.12 Comparing the molecular based and grade-based trees of animal phylogeny Figure 32.13 A sample of some of the animals that evolved during the Cambrian explosion Figure 32.13x Burgess Shale fossils Figure 32.14 One Cambrian explosion, or three? Figure 34.1 Clades of extant chordates Figure 26.0 A painting of early Earth showing volcanic activity and photosynthetic prokaryotes in dense mats Figure 26.0x Volcanic activity and lightning associated with the birth of the island of Surtsey near Iceland; terrestrial life began colonizing Surtsey soon after its birth Figure 26.2 Clock analogy for some key events in evolutionary history Unnumbered Figure (page 512) Evolutionary clock: Origin of life Unnumbered Figure (page 512) Evolutionary clock: Prokaryotes Figure 26.3 Early (left) and modern (right) prokaryotes Figure 26.3x1 Spheroidal Gunflint Microfossils Figure 26.3x2 Filamentous cyanobacteria from the Bitter Springs Chert Figure 26.4 Bacterial mats and stromatolites Figure 26.4x Stromatolites in Northern Canada Unnumbered Figure (page 513) Evolutionary clock: Atmospheric oxygen Figure 26.5 Banded iron formations are evidence of the vintage of oxygenic photosynthesis Unnumbered Figure (page 514) Evolutionary clock: Eukaryotes Unnumbered Figure (page 514) Evolutionary clock: Multicellular eukaryotes Figure 26.6 Fossilized alga about 1.2 billion years old Figure 26.7 Fossilized animal embryos from Chinese sediments 570 million years old Unnumbered Figure (page 515) Evolutionary clock: Animals Unnumbered Figure (page 515) Evolutionary clock: Land plants Figure 26.8 The Cambrian radiation of animals Figure 26.9 Louis Pasteur Figure 26.9 Pasteur and biogenesis of microorganisms (Layer 1) Figure 26.9 Pasteur and biogenesis of microorganisms (Layer 2) Figure 26.9 Pasteur and biogenesis of microorganisms (Layer 3) Figure 26.10 The Miller-Urey experiment Figure 26.10x Lightning Figure 26.11 Abiotic replication of RNA Figure 26.12 Laboratory versions of protobionts Figure 26.13 Hypothesis for the beginnings of molecular cooperation Figure 26.14 A window to early life? Figure 26.15 Whittaker’s five-kingdom system Figure 26.16 Our changing view of biological diversity