what did rosalind franklin discover

Dr. Rosalind Franklin was a British scientist who made significant contributions to the discovery of the molecular structure of DNA. She applied X-ray diffraction methods to the study of DNA and discovered the density of DNA and established that the molecule existed in a helical conformation. Her work to make clearer X-ray patterns of DNA molecules laid the foundation for James Watson and Francis Crick to suggest in 1953 that the structure of DNA is a double-helix polymer, a spiral consisting of two DNA strands wound around each other. Franklins creation of the famous Photo 51 demonstrated the double-helix structure of DNA. She also differentiated the A and B forms of DNA, solving a problem that had confused previous researchers. Franklins contribution to the discovery of the double helix was crucial, but she did not receive the recognition she deserved at the time.