Figure 2.

Examples of IGT. (A) RCO affects leaf morphology and a copy of the gene from the compound leaved mustard Cardamine hirsuta is able to transform the simple leaves of Arabidopsis thaliana into complex lobed leaves. A genomic locus of the paralog of RCO, LMI1, transformed in A. thaliana is not able to modify leaf morphology but plants expressing LMI1 driven by the RCO promoter have lobed leaves, suggesting regulatory divergence of the two paralogs. (B) Pitx1 enhancer affects pelvic morphology in sticklebacks; transfer of the enhancer and coding sequence of pelvic-complete stickleback into a pelvic-reduced stickleback results in pelvic expression and development.