Figure 1From: Distribution of 45S rDNA sites in chromosomes of plants: Structural and evolutionary implicationsVariation in the number of rDNA sites per karyotype in a sample of 665 angiosperm (a) and 64 gymnosperm (b) karyotypes. Polyploid cytotypes and species with holokinetic chromosomes were not included. The median is underlined and the modal number is indicated by #. Sample size: 729 karyotypes.Back to article page