Figure 24.0 A Galápagos Islands tortoise

Figure 24.1 Two patterns of speciation

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 24.6 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 24.17 Two models for the tempo of speciation

Figure 24.18 A range of eye complexity among mollusks

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