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 in May 1994, the network arranged a deal with New World Communications, which saw nearly all of that group's stations (most of which were VHF outlets) becoming Fox affiliates. Fox then acquired New World Communications outright in July 1996, and those VHF stations (including one in Dallas) became Fox owned-and-operated stations in the process. The network, however, did acquire more UHF O&Os in subsequent years, including Philadelphia's WTXF-TV (channel 29) in 1995, Orlando's WOFL (channel 35) in 2002 and Charlotte's WJZY (channel 46) in 2013. As a result of the New World deal, CBS lost its longtime Detroit affiliate WJBK