Answer:
they suggested that DNA could make exact copies of itself
Explanation:
The two had shown that in DNA, form is function: the double-stranded molecule could both produce exact copies of itself and carry genetic instructions.Watson and Crick developed their ideas about genetic replication in a second article in Nature.
Didn't quit understand the question but if you were asking who basically came up with the idea of offspring inherited traits then the idea was proposed in ancient times by Hippocrates and Aristotle and was commonly accepted near to Lamarck's time.