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That background information did Watson a...

That background information did Watson and Crick have made available for developing a model of DNA ? What was their contribution ?

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Watson and Crick had the following informations which helped them to develop a model of DNA
(i) Chargaff's' Law suggesting A=T, and C=G
(ii) Wilkins and Rosalind Franklin's work on DNA crystal's X-ray diffraction studies about DNA's physical structure.
(iii) Watson and crick proposed
(a) How complementary bases may pair
(b) Semi conservative replication and
(c) Mutation through tautomerism.
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