Epigenetic regulation of transposable elements in the plant kingdom which allows for self-copying) within the coding of the transposon defines class I elements as autonomous or non-autonomous. Class I transposons can take the form of: Curiously, retrotransposons have been discovered to be the predominant form of transpositional element in plants with large genomes, such as maize and wheat, potentially indicating rapid success of this class of transposon in the creation of hybrids, such as wheat, peppermint and, in the distant past, maize. Plant hybridization often creates polyploids, with double, triple, quadruple or more the number of chromosomes present in the parent generation. Polyploid hybrids seem to be particularly susceptible
Owned-and-operated television stations in the United States as WRCA/WRCV did. In 1965, NBC was forced to reverse the trade on orders from the Federal Communications Commission and the United States Department of Justice. WRCV-TV's callsign was then changed to KYW-TV to match its radio cousin. When NBC regained control of the Cleveland stations, it changed their callsigns to WKYC-AM-FM-TV, because of the AM station's popularity as "KY11". It sold the radio stations in 1972, but kept WKYC-TV until 1990, when majority control of the station was sold to Multimedia, Inc. (which later merged with the Gannett Company in 1995); NBC remained minority owner of WKYC-TV until 1999