Question

explain how the discoveries by rosalind franklin helped watson and crick build an accurate model of dna.

Explanation:

Rosalind Franklin used X - ray crystallography to study DNA. Her famous "Photo 51" provided crucial data. The X - ray diffraction pattern in the photo showed that DNA had a helical structure. The spacing and angles in the pattern indicated the dimensions of the helix. This information was essential for Watson and Crick. They used it to determine that DNA was a double helix. The data also helped them figure out the number of strands and the orientation of the bases within the helix.

Answer:

Rosalind Franklin's X - ray crystallography (specifically "Photo 51") showed DNA was helical. The diffraction pattern gave dimensions (like helix width and base - pair spacing). Watson and Crick used this to build the double - helix model, determining strand number and base orientation.