The awesome feat of compiling the Book of Life was accomplished by technologies that spelled out the entire human DNA genome (made up of the chemical base pairs symbolized by the letters A,G,C and T). Simply, we can think of DNA as a string of 3 billion of these letters, in which the sequence of letters follows a precise order. If we compare the DNA sequence of any two people, we sometimes see variation in a letter. This letter variation is a SNP. For example, at a specific position along the string of DNA, one person may have the letter "A" whereas another person may have the letter "T". These variations (SNPs) occur, on average, once in every 2,000 letters of the DNA.
More to come ....
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