History of DNA
Gregor Mendel, also known as "the father of modern genetics", discovered the basic principles of heredity through experiments. Around 1854, Mendel began his experiments. His experiments didn't seem to work so it resulted in 8 years (1856-1863) in more experiments with multiple plants. With the help of his pea experiments, he discovered the laws of inheritance. He discovered that genes come in pairs and are inherited as distinct units, one from each parent.
Erwin Chargaff was a famous biochemist who helped with the research of DNA. Chargaff discovered the two rules that helped lead to the discovery of the double helix structure of DNA. He explained that organisms are made of different DNA's. It made DNA have more responsibility for genetic material than proteins.