Question

how did watson and crick first learn about the helical structure of dna? from rosalind franklins x-ray image from their own x-ray experiments by studying bacteriophages from linus paulings model

Explanation:

Rosalind Franklin's X - ray diffraction image (Photo 51) was crucial. It provided key structural information about DNA. Watson and Crick were able to use this image to build their model of the DNA double helix. Their own X - ray experiments were not the first source. Studying bacteriophages was more related to other aspects of DNA research (like the Hershey - Chase experiment which showed DNA is genetic material). Linus Pauling's model was incorrect (a triple - helix model for DNA).

Answer:

from Rosalind Franklin's x - ray image