The Human Genome Contains About Three Billion Base Pairs
That is roughly 3.1 billion of the chemical letters that make up a person's DNA.
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The Human Genome Project Was Declared Complete in 2003
A truly gap-free human genome sequence was only published in 2022.
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Any Two Humans Are About 99.9 Percent Genetically Identical
The tiny remaining difference accounts for the variation between individuals.
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DNA Is Written in an Alphabet of Only Four Bases
Adenine, thymine, cytosine and guanine pair up to form the rungs of the double helix.
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Watson and Crick Described the Double Helix in 1953
Their model relied on X-ray images by Rosalind Franklin, and Watson, Crick and Maurice Wilkins won the Nobel Prize in 1962.