From: Distribution of 45S rDNA sites in chromosomes of plants: Structural and evolutionary implications
 | Angiosperms | Gymnosperms | Total | |
---|---|---|---|---|
 | Monocentrics | Holokinetics |  |  |
Number of karyotypes | 856 | 63 | 65 | 984 |
Mean of sites (s.d.) | 5.1 (3.6) | 6.6 (6.6) | 10.4 (7.1) | 5.5 (4.4) |
Median | 4 | 4 | 10 | 4 |
Mode | 2 | 4 | 2 | 4 |
Range | 2 - 32 | 2 - 45 | 2 - 34 | 2 – 45 |
Karyotypes with single site* | 265 (31.0%) | 6 (9.5%) | 11 (16.9%) | 282 (28.7%) |