DNA Discovery: The Foundation of Modern Biology

DNA discovery revolutionized scientific understanding of heredity and life itself. While scientists in the 19th and 20th centuries contributed to this breakthrough, the critical moment came when James Watson, Francis Crick, and Rosalind Franklin worked to unlock DNA's structure at Cambridge University in England during the early 1950s.

Key Milestones

• Friedrich Miescher (1869) - isolated "nuclein" from white blood cell nuclei in Basel, Switzerland, marking the first chemical extraction of DNA
• Chargaff's Rules (1950) - Erwin Chargaff discovered that DNA contains equal amounts of adenine and thymine, plus equal amounts of guanine and cytosine (50% proportional ratio)
• Photo 51 (1952) - Rosalind Franklin's X-ray crystallography image at King's College London provided crucial evidence of DNA's helical structure
• The Double Helix Model (1953) - Watson and Crick published their findings in Nature, proposing DNA's famous twisted ladder shape

The Nobel Prize in Physiology or Medicine (1962) honored Watson, Crick, and Maurice Wilkins for their DNA structure discovery. This revelation explained how genetic information passes between organisms and established the molecular basis for all biological inheritance, transforming medicine, forensics, and evolutionary science forever.

Reference:

Wikipedia reference

https://en.wikipedia.org/wiki/Science