Question 581670: DNA (deoxyribonucleic acid) is the basis of most genes. DNA is made of nucleotides. Each nucleotide can contain any one of these four nitrogenous bases is a linear sequence: A (adenine), G (guanine), C (cytosine), T (thymine). If an experimenter wishes to create a gene with a sequence of 9 bases, where bases can be repeated and order matters, how many different sequences are possible?
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! There are 4 possibilities for the first position
There are 4 possibilities for the second position
...
etc
Now multiply all these out
So there are 4*4*4*4*4*4*4*4*4 = 4^9 = 262144 different sequences
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