Gregor Mendel discovered the principles of genetics. He used pea plants to study traits and how they are passed on. This started a study and science of genetics.
Rosalind Franklin discovered that DNA is a form of helix by recording a diffraction pattern.
Barbara McClintock discovered that genes could be mobile, which she called "Jumping Genes".
Watson and Crick together discovered the Double Helix, which is the twisted ladder structure of DNA.
The Genetic Code was discovered and this helped scientists predict characteristics by studying DNA.
Gene Therapy was used on patients fro the first time.
Dolly the Sheep was the first mammal to be cloned.
The Human Genome Project announced that the sequencing of human genome was at an accuracy of 99.9 percent.