The Human Genome Project is probably the most ambitious scientific proposal ever made.
ii. writing DNA
Synthesising short, single stranded fragments of DNA, called oligonucleotides (oligos for short) has been automated and affordable for a number of years now, and almost every biology laboratory in the world uses these short fragments (usually 18–25 base-pairs — compare this to the human genome which is 3 billion base-pairs long) for applications ranging from disease diagnostics to making genetically modified plants. What really has been a game-changer in DNA synthesis is the ability to synthesise longer pieces of DNA and the ability to join these together efficiently to form synthetic gene length fragments.