Topic
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Statistic
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Total size of the genome:
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approximately 3,200,000,000 bp*
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Percentage of adenine (A) in the genome:
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54%
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Percentage of cytosine (C) in the genome:
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38%
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Percentage of bases not yet determined:
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9%
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Highest gene-dense chromosome:
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chromosome 19 with 23 genes per 1,000,000 bp*
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Least gene-dense chromosomes:
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chromosome 13 and Y with 5 genes per 1,000,000 bp*
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Percentage of DNA spanned by genes:
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between 25% and 38%
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Percentage of exons:
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1.1 to 1.4%
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Percentage of introns:
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24% to 37%
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Percentage of intergenic DNA:
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74% to 64%
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The average size of a gene:
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27,000 bp*
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The longest gene:
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dystrophin (a muscle protein) with 2,400,000 bp*
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Average length of an intron:
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3,300 bp*
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Most common length of an intron:
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87 bp*
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Occurrence rate of SNPs:
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roughly 1 per 1,500 bp*
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Occurrence rate of genes:
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about 12 per 1,000,000 bp*
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