Question

Below is a segment of an electrophorogram of a dideoxy sequencing gel. The origin is at the top. The positive pole is at the

I got the last answer and it was wrong. Can you explain how you get your answer please?

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Answer #1

Correct answer is A. 3' TCGTCTTCAAGC

Because to analyze the gel you have to read the gel from the bottom to the top which will be the 5' to 3' direction of the daughter strand.

In this case the sequence of daughter strand is 5' AGCAGAAGTTCG 3'

So the original strand will be the reverse complementary of this sequence i.e. 3' TCGTCTTCAAGC 5'

N.B. You have to read the gel from the bottom to the top because the 1st nucleotide is the smallest hence it will appear last and the total DNA is largest so it will move least. So, you have to read the gel from the bottom.

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