DNA is made up of chemical building blocks abbreviated A,C,T and G.The entire length of a DNA strand consists of these four blocks in different combinations.Together, all the DNA in all the chromosomes - more than 3 billion letters - makes up the human genome. When scientists say they have “ sequenced” the human genome, thay mean that they have figured out the other of all those A’s, C’s, T’s, and G’s in sequence.
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