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Barbara Mcclintock examined the mechanism for the appearance of purple spots in the kernels of yellow and white corn. She attributed the spots to transposable elements(TE) or jumping genes.
McClintock studied the so-called Ac/Ds system in maize, which she learned about by carrying out conventional genetic breeding experiments with a peculiar phenotype. Through these tests, McClintock discovered that breakage happened at particular locations on the maize chromosomes.
She did, in fact, find the first transposable element (TE) at the aptly termed "dissociation" location of chromosome breakage (Ds). McClintock initially observed that the movements of Ds are controlled by an autonomous element called "activator" (Ac), which may also promote its own transposition. She later discovered that some TEs could "jump" autonomously.
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