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Table 1 Statistics of B. rapa chromosome A3

From: Sequence and structure of Brassica rapachromosome A3

  B. rapachromosome A3 A. thalianawhole genome
Total number of BACs 348 1,633
Approximate chromosome length (Mb) 34.2 134.6
Total non-overlapping sequence (Mb) 31.9 119.1
G/C content (%)   
   Overall 33.8 35.9
   Exons 46.4 44.1
   Introns 32.4 32.6
   Intergenic regions 29.6 32.9
Number of protein coding genes 7,058 27,379
   Number of exons per gene 4.7 5.7
   Intron size (bp) 170 165
   Exon size (bp) 222 304
Average gene size (bp) 1,755 2,467
Average gene density (bp/gene) 4,633 4,351
Alternatively spliced genes 184 4,626
Known genes 5,825 21,498
   Average known gene size (bp) 1,231 2,384
Unknown genes 1,415 5,784
   Average unknown gene size (bp) 547 1,489
Hypothetical genes 2 97
   Average hypothetical gene size (bp) 1,681 686
tRNA genes 164 689
miRNA genes 26 215
Transposons (%) 5 13
  1. The B. rapa chromosome A3 statistics were generated in this study. The Arabidopsis genome features are from The Arabidopsis Information Resource database (release TAIR9) [23].