In this example the marker DNA includes fragments that have 23,130, 9,416, 6,557, 4,361, 2,322, 2,027, and 564 base pairs. Approximately how many base pairs are in the DNA fragment indicated by the letter A?
The figure shows the results of gel electrophoresis. In this figure, the marker DNA has seven bands; their lengths are 23130, 9416, 6557, 4361, 2322, 2027, and 564 base pairs respectively. The first researched DNA has two bands. The first, indicated by the letter A, complies to the third band of the marker DNA and the second is located between the sixth and the seventh bands of the marker DNA. The second researched DNA has three bands. The first, indicated by the letter B, is located between the third and the fourth bands of the marker DNA and two others are located between the sixth and the seventh bands.