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 Pickwick Papers (1952 film) The Pickwick Papers (1952 film) The Pickwick Papers is a 1952 British black-and-white film based on the Charles Dickens classic. Both screenplay and direction were by Noel Langley. The film premiered at the Gaumont Cinema at Haymarket in London on 14 November 1952. In 1954, the Soviet Union paid £10,000 for the distribution rights, and it became the first British film to be shown in the Soviet Union after World War II, premiering on 29 July 1954 in a number of cities with a dubbed soundtrack. The film was followed a month later by a Russian reprint of Dickens's book,