Q. 9.  That background information did Watson and Crick have made available for developing a model of DNA? What was their contribution?


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 DNAs physical structure.

Watson and Crick proposed

(a) Pattern of complementary bases pair

(b) semi-conservative replication

(c) Mutation through tautomerism