Photo of Barbara McClintock

Barbara McClintock

  • National Medal of Science
  • Biological Sciences

For establishing the relations between inherited characters in plants and the detailed shapes of their chromosomes, and for showing that some genes are controlled by other genes within chromosomes.

Barbara McClintock worked 12 hours a day, six days a week – dedicating her life to the secrets held together by yellow kernels of starch.rnrn“I know my corn plants intimately,” she said, “and I find it a great pleasure to know them.”rnrnMcClintock’s work focused on Zea mays, known commonly as “maize,” and the plants that produce ears of varying colors.rnrnIn the 1940s and 1950s, McClintock proved that individual genes – called “jumping genes” or “transposons” – can change places on the chromosome, producing different color patterns.rnrnThis idea refuted popular genetic theory that genes maintain fixed positions on chromosomes. McClintock, convinced the scientific community wouldn’t accept her findings, didn’t win the Nobel Prize until 40 years later.rnrnIn the decades that followed, her discovery paved the way for mapping of the corn genome, a project that has allowed agricultural researchers to genetically modify the crop to increase its tolerance to factors including drought.