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Question:
a) Define zero and first order Markov models for seqeuence1.txt. The sequence is Mycobacterium tuberculosis gene mtb48
Hints:- Zero order Markov model is defined by P(i), where i= {A,T,G,C}For this you simply need the nucleotide counts and total number of nucleotides.Zero order Markov model for DNA sequence should have four parameters- First order Markov Model is defined by P(i|j), where i,j ={A,T,G,C}. For example P(A|T) is probability of observing A after T in DNA sequenceFor this you'll need the number of occurrences of di-nucleotides and the total number of di-nucleotidesFirst order Markov model for DNA sequence should have sixteen parameters.- To implement this, it would be easiest to write a small script in R using a alphabetFrequency() and dinucleotideFrequency() function of the Biostrings package. Or you can use perl or any other programming language of your choice. Otherwise, if you really have to (you exhausted all the options, see no other way and hopelessly behind on your schedule) you can use Microsoft Word or Excel substitute function or MS word's find/replace.
b) Using models you derived in (a) determine the probability of DNA fragment AGTAGCTTCCAG.
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The assignment was focused on bioinformatics based problem which is related to Markov model.Both zero and first order Markov model are calculated and shown 4 and 16 parameters respectively.
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