Table 1 DNA and gene content of human chromosomes
ChromosomeApproximate length (bp)Protein-coding genesNon-protein coding genesPseudogenes
1248956422204719641233
2242193529130316051033
319829555910751160768
4190214555753984732
51815382598811200710
61708059791041989803
7159345973989977893
81451386366701041629
9138394717778786678
10133797422728880568
1113508662213121053815
1213327530910361197627
13114364328321586378
14107043718820857519
15101991189613986513
16903383458671033467
178325744111851198531
1880373285269608246
19586176161474895514
2064444167543594250
2146709983231403183
2250818468492513332
X156040895843640872
Y5722741563108392
Mitochondrial165691324
  • Note that although these numbers seem very precise they should be taken as indicative only, since (i) chromosomes of each individual will vary from the reference sequence, and (ii) the human reference genome sequence is continuously updated with corrections (the data here are from GRCh38.p12, which represents a particular ‘build’ of the human genome). Note that the data for the acrocentric chromosomes 13, 14, 15, 21, 22 does not include the shared ribosomal DNA array repeats present on the p arms (see Figure 2). Data from Ensembl, June 2018.