Genome sequencing is figuring out the order of DNA nucleotides, or bases, in a genome—the order of As, Cs, Gs, and Ts that make
up an organism’s DNA. The human genome is made up of over 3 billion of these genetic letters.Today, DNA sequencing on a large scale—the scale necessary for ambitious projects such as sequencing an entire genome—is mostly done by high-tech machines. Much as your eye scans a sequence of letters to read a sentence, these machines “read” a sequence of DNA bases.
A DNA sequence that has been translated from life’s chemical alphabet into our alphabet of written letters might look like this: