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What 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)  Chargaffs’ 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

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