Why would concluding that there is a lack of pairing of the bases contradict wilkins' and franklin's data

The photo called photo 51 A was produced by the Rosalind Franklin who was working on the structure of DNA.

She produced the picture of DNA with the help of the X-ray diffraction technique and found that DNA structure is helical in appearance.

The photo was later used by the Watson and Crick who gave the structure of the DNA using the photo as reference. They showed the chemical bonds formed between the two strands of DNA.

They used the Chargaff rule of complementary base pairing that A will bind T and G will bind C which if not followed or lacks will produce an alignment which will not allow the formation of a helical structure. The lack of base pairing will allow the formation of just single-stranded structure and not double-helical structure.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

the electromagnetic energy from the sun arrives in the form of visible and invisible light.