The DNA bookshelf…
(DNA code represented by the letters A, C, G & T)
The ‘DNA code’ can be represented by the letters A, C, G, and T. The letters can be combined in many ways (AGACCCGGGTTTAACCC….) and about 300 of these letters spell out the instructions for a gene, like eye colour for example.
Each person has over 20,000 genes as well as ‘junk’ DNA. If you could type 60 words per minute, eight hours a day, it would take approximately 50 years to type out all the letters.
People have used a computer to print out the code in tiny font, however, and it fills 100 volumes–a whole bookcase worth of A,C,G and T to represent the DNA of just one person!