A focus on new kinds of model organisms such as viruses and bacteria, along with the discovery of the double-helical structure of DNA by James Watson and Francis Crick in 1953, marked the transition to the era of molecular genetics.
Tarkiz ijjan fal dumu tan eynaynen n dumu n birus tan d bacteria ɣur afukkar n double-helical structure tan DNA ijja James Watson d Francis Crick daɣ awatay wan 1953 eqqal echwal s iki n azzaman wan molecular genetics