Since the sequence of base arrangement in Figure A has been interpreted, the sequence is GGTTATGCGT, so we can know that the spot hole in this electrophoresis is at the top, and the sequence from left to right is ACGT. Since the two figures are the same, we can infer that the base sequence in Figure B is GATGCGTTCG.

Problem solving skills:

That is, in Figure A, there are two consecutive GGs and TT. It is determined that the third lane is G, the fourth lane is T, and the bottom is a short section (not abnormal, there is no hole below), then the first one is A, and then the second one is C. I know that the first lane is A and the second one is T.

PS:

Although the question is simple, I still want to explain to you the following supplementary ideas for answering the question. Five points is too little, just add as much as you want, and typing is very hard.