a figure from the essay
Homeotic Genes and the Evolution of Anthropods and Chordates
by Sean B. Carroll

Figure 1 (from page 71 of Shaking the Tree: Readings from Nature in the History of Life edited by Henry Gee)

Hox gene organization and expression. Top, the AP domains of Drosophila Hox gene expression correspond to the order of the genes within the Hox complex. Middle, the evolutionary relationship between the Drosophila, amphioxus and mouse Hox clusters, and the deduced complement of Hox genes in the presumed common ancestor of arthropods and chordates. Bottom, the AP domains of mouse Hox genes within the developing mouse also correspond to gene order in the Hox complexes. Adapted from refs. 50, 52 and 75.

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About the book: Shaking the Tree: Readings from Nature in the History of Life edited by Henry Gee, published by the University of Chicago Press.