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What background information did Watson and Crick had available with them for developing a model of DNA? What was their own 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 Franklin’s X-ray diffraction studies on DNA’s physical structure. 

Based on these information, Watson and crick proposed 

i. complementary base-pairing of nitrogenous bases 

ii. semi-conservative mode of replication 

iii. occurrence of mutation through tautomerism.

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