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
The Double Hook hook twice the fear." Watson wrote "The Double Hook" between 1952 and 1954 in Calgary, Alberta and revised it during a year spent in Paris. Throughout the 1950s she was unable to find a publisher. "T.S. Eliot at Faber & Faber, C. Day-Lewis at Chatto & Windus, and Rupert Hart-Davis all turned it down." McClelland & Stewart optioned the book in Canada, largely on the strength of a covering letter by Fred Salter of the University of Alberta calling it "the most brilliant piece of fiction ever written in Canada." To decide on publication, though, the company sought the opinion