In 1953, who developed the model that is shown below?

There is no attached model, but the greatest discovery in biology in 1953 could be only the discovery of DNA double helix. Watson and Crick discovered the chemical structure of DNA molecule. They showed that the molecule is looked like twisted ladders, and described it as a double helix. Their discovery was the great basis for a development of modern molecular biology.

The answer is observations and interpreting.