Barbara McClintock was a cytogeneticist whose genius for microscopic observation led to the discovery of genetic transposition. While studying the chromosomes of maize (corn), she noticed that certain genetic elements could 'jump' from one location on a chromosome to another. These 'transposable elements' could turn other genes on or off, explaining how complex patterns appear in corn kernels. Her discovery challenged the existing belief that genomes were static. Because her findings were so far ahead of their time, they were met with skepticism for decades. It wasn't until the 1970s, with the advent of molecular biology, that the importance of 'jumping genes' was fully realized, leading to her Nobel Prize in 1983.