Figure 3.

A visual representation of one possible evolutionary scheme between the rice and barley colinear sequences. Evolutionary events move upwards toward present day rice (A and B) and downward toward present day barley (C–I) from the presumed last common ancestor. C, An intra-chromosomal rearrangement results in the repositioning of two conserved gene clusters. D, Translocation involves the relocation of CHS. E to G, Subsequent duplications and a gene inversion generate the individual grain texture genes. A and B, H to I, Independent gene duplications and inversions generate numerous copies of ATPase in both species. The two severely degenerate copies of barley ATPase are not present in this scheme.