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 television stations were on the UHF band, along with the fact it saw the advantage of having a statewide network to share California news coverage and events with, using the resources of KFSN, KGO-TV and KABC-TV. By the time the Fox network launched in October 1986, many of the nation's VHF stations were already affiliated with one of the "Big Three" networks. As a result, Fox had little choice but to affiliate with UHF stations in most markets upon its launch (the few VHF outlets that the network initially affiliated with, a few of which were owned by Fox itself,