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Assuming no sequencing errors, two DNA sequencesTGAC and CATGA can be assembled into the original sequence in two different ways:TGACATGAandCATGAC. (Assume that each of the four nucleotides occurs with the same frequency.)

What is the probability of the original sequence beingTGACATGAby random chance?

What is the probability of the original sequence beingCATGACby random chance?

Which one is considered more likely to be the original sequence?

1/4 (1/4)3 (1/4)2

TGACATGA, as it is more likely by chance TGACATGA, as it is less likely by chance CATGAC, as it is less likely by chance