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There are about 25000 genes in the human genome. If you wanted to use a stretch of the DNA of  each gene as a unique identification tag, roughly what minimum length of DNA sequence would  you need? To be unique, the length of DNA in nucleotides would have to have a diversity (the  number of different possible sequences) equivalent to at least 25000 and would have to be present once in the haploid human genome (3.2¡Á109 nucleotides)? (Assume that A,T,C, and G are present in equal amounts in the human genome.)

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