(d) It was only in 1953 that James
Watson and Francis Crick, based on the X-ray diffraction data produced by
Maurice Wilkins and Rasalind Franklin, proposed a very simple but famous double
helix model for the structure of DNA.
Erwin Chargaff observed that for a
double-stranded DNA, the ratios between adenine and thymine and guanine and
cytosine are constant and equals one.
On the other bond Matthew
Meselson and Franklin Stahl in 1958 performed experiments on E.coli to prove
that DNA replication is semi-conservative. But had no contribution it the
development of double helix model.
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