Figure 4.

Overview of the evolutionary karyotypic pathways proposed for karyomorphs A-D of Erythrinus erythrinus on the basis of their karyotypic features and FISH mapping results for karyomorphs A and D. The main chromosomal changes from the probable basal karyotype (2n = 54; 6m + 2st + 46a) are underlined. The upward schematic figure illustrates the chromosomal distribution of the 18S rDNA and 5S rDNA/Rex3 sequences in karyomorph A and the expanded distribution of the latter sites in karyomorph D, including the Y, X₁ and the probable X₂ chromosome. The different colors represent the probes used for FISH.