Explain the role of scientist :

$1.$ Watson and Crick  $(1953)$

$2.$ Erwin chargaff

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 proposed a very simple but famous Double Helix model for the structure of $DNA$.

Erwin Chargaff that for a double stranded  $DNA$ , the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equals one.

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