Barbara McClintock won the 1983 Nobel Prize in Physiology or Medicine for discovering transposons — stretches of DNA that can move from one place in the genome to another. The press called them "jumping genes."
Working with maize in the 1940s and 1950s, she showed that the genome is not a fixed string of instructions but a dynamic system that can rearrange itself. Her ideas were so far ahead of their time that many colleagues doubted them for decades.
Molecular biology eventually caught up, confirming that transposable elements are widespread — shaping evolution, disease and the very structure of genomes across living things.
Why it matters: McClintock revealed that the genome can rewrite itself, a discovery that reshaped genetics and rewarded decades of patient, unfashionable science.
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