Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.

Answer:

Rosalind Franklin’s image showed that DNA consists of two strands twisted into a double helix, with a phosphate backbone on the outside and bases inside. Her measurements of the DNA’s diameter, the spacing between strands and bases, the helix angle, and the number of bases per coil helped Watson and Crick build an accurate model.