DNA frequency

[Awuah29]

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Ok guys,

The complementary sequence to the follwoing string of nucleotides
5' -GGATCGTAGCCTA-3' is
3' -CCUAGCAUCGGAU-5' right?

Now my question is how frequently would you expect to find the sequence
5' -GGATCGTAGCCTA-3' of nucleotides in a DNA molecule as a result of random chance if each of the four nucleotides occurs with the same frequency?

Thanks guys

 

[klutzy1987]

I would say it would be 1/4 raised to the 13 power.

 

[Awuah29]

I would say it would be 1/4 raised to the 13 power.

klutzy, you making this up . No seriously anyone know the answer?

 

[Awuah29]

I would say it would be 1/4 raised to the 13 power.

I wonder how you got that answer? 😀

 

[klutzy1987]

well, there are 4 chioces for each nucleic acid, A,C,T,G. So there is a 1 in 4 chance of getting each individual necleic acid. Since the chain is 13 nucleic acids long it would be 1/4*1/4*1/4 etc.... 13 times, hence 1/4 raised to the 13.

 

[doc3232]

It is 1/4^13. I agree.
Is this for your class or something? This would never be on the DAT.

 

[Rubber Dam Man]

yes, that is correct. if you reason it out... exactly how klutzy explained... you will arrive at the correct answer.