Question

How many different DNA molecules 6 nucleotide pairs long are possible?

Answer 1

Since there are four kinds of nucleotides, at any base-pair position in a molecule of DNA, there are four possible nucleotides that can retain that particular site. The same is true for any position within the molecule. Using the product rule, then the possible arrangments of nucleotides occupying positions one and two simultaneously is, 4 × 4 = 16 possibilities. or 4², here the exponent is the number of sites under consideration. if we put 6 instead of 2 we would get the possible number of Different DNA combinations.

4⁶ = 4096 combinations.

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