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Table 2 Frequency of rDNA sites in the short and long chromosome arms

From: Distribution of 45S rDNA sites in chromosomes of plants: Structural and evolutionary implications

Sites

Number of karyotypes

Short arms

Centromeric sitesa

Long arms

Total

p-valueb

Singlec

220

342 (77.7%)

4 (0.9%)

90 (20.9%)

440

0.000001

Multiple

509

2,430 (68.9%)

132 (3.7%)

964 (27.3%)

3,526

0.000001

Total

729

2,772 (69.9%)

138 (3.5%)

1,056 (26.6%)

3,966

0.000001

  1. a Sites between the short and long arms whose exact position was not identified.
  2. b Chi-square comparison against an equal distribution of sites per arm.
  3. c Karyotypes with a single pair of sites.