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Scientific milestone

The DNA double helix

Explaining how DNA's molecular structure could carry and copy genetic information.

When
1953
Where
Cambridge and London, Britain
Modern molecular illustration of a section of the DNA double helix.
Modern molecular illustration of a section of the DNA double helix.

The double-helix model connected the structure of DNA with heredity. James Watson and Francis Crick developed the model using chemical and experimental evidence, including X-ray work by Rosalind Franklin and Maurice Wilkins.

01

Background

A molecular question

Researchers knew that understanding heredity required explaining the physical organisation of genetic material. Evidence came from several laboratories rather than one isolated experiment.[1]

02

What happened

  1. 1953

    Model published

    Watson and Crick's paper appeared in Nature on 25 April.[1]

  2. 1962

    Nobel recognition

    Watson, Crick and Wilkins shared the medicine prize for work on nucleic-acid structure and information transfer.[1]

03

Impact & evidence

1953

Evidence behind the model

X-ray diffraction work by Rosalind Franklin and Raymond Gosling helped constrain the possible shape of DNA. The 1953 double-helix model brought experimental evidence together with chemical reasoning about how its components could fit. Complementary base pairing also suggested how genetic information could be copied. Reducing the discovery to a single photograph or a sudden flash of inspiration obscures the experimental work and the question of how unpublished results were shared.[3]

04

Aftermath & legacy

Credit and discovery

Franklin's experimental contribution is essential to this history. The model became a foundation for molecular biology, while accounts of its discovery continue to examine access to data and recognition.[1]

A structure opened further questions

Knowing DNA’s shape did not by itself explain every step between a gene and an organism’s characteristics. It gave researchers a physical framework for investigating replication and the storage of biological information. Franklin’s contribution has since become central to reassessments of how credit was distributed among the scientists involved.[4]

Sources & image credits (4)
  1. Nobel Prize — What is life? ↗
  2. Nobel Prize — Cells, nerves and genes ↗
  3. nature.com — historical account ↗
  4. nature.com — historical account ↗

84user adapting file originally uploaded by Richard Wheeler ( Zephyris ) at en.wikipedia; CC BY-SA 3.0; via Wikimedia Commons. Image source ↗

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