Figure 1. The relationship of the major mammal groups. The divergence times, in millions of years before present, appear at each node.

Figure 2. Comparative mapping of human chromosome 6. The genes on human chromosome 6 that have been mapped in other species (excluding just mouse) are represented at their location, and a symbol appears beside this gene in every other species in which it has been mapped. Symbols are joined in a vertical line where these genes lie on the same chromosome, and the number of this chromosome appears beside the line.

Figure 3. Chromosomes of the swamp wallaby (a species with only five enormous chromosomes) are ‘painted’ with flourescence-tagged DNA from individual chromosomes from the related tammar wallaby (a species with seven chromosomes). Tammar chromosome 2 (green); tammar chromosome 7 (pink); X chromosome (white). The same blocks of genome are present, but have been stuck together in the swamp wallaby.