Francis Crick

Francis Crick was a physicist who is best known as the co-discoverer of the structure of DNA in 1953 with James Watson. Crick and Watson both created a model of DNA using Franklin's Photo 51 and her idea that DNA is a double helix. This model led to people wanting the knowledge of how cells reproduced and how DNA splits. Watson and Crick also came up with the ideas that two outside strands consist of alternating deoxyribose and phosphate. They also discovered that cytosine and guanine bases pair to each other by three hydrogen bonds and that thymine and adenine bases pair to each other by two hydrogen bonds.