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 stations were subsequently acquired by the Sinclair Broadcast Group; WLWC, in turn, has since been spun off to OTA Broadcasting, LLC. In June 2010, CBS announced the sale of its Norfolk, Virginia CW O&O WGNT (channel 27) to Local TV, then owner of that market's CBS affiliate WTKR-TV (channel 3) (as well as seven former Fox O&O stations). This created the second television duopoly in that market (the first involved LIN TV-owned NBC affiliate WAVY-TV (channel 10) and Fox affiliate WVBT (channel 43)). As part of the deal, Local TV would take over the operations of WGNT through a time