Answer:
DNA base sequence
Step-by-step explanation:
DNA is made up of nucleotide bases in pair of three generally termed as codons. There are 3 billion DNA sequence in a human being as per the human genome project. These 3 billion sequences form more than 20000 genes. Almost all the human genes are similar in structure and arrangement up to a percentage of ninety nine percent. Only 1 % of the genes are different or varying. With this 1% gene, nearly millions of combinations can be formed which in a way is sufficient to make us unique.