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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 information 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 physical structure .
Warson and Crick
(a) Pattern of complementary bases pair
(b) Semi-comservation replication
(c)Mutation through tautomerism
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