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
Double (basketball) seasons. A quadruple-double is the accumulation of a double-digit number total in four of the five categories in a game. This has occurred four times in the NBA. A quintuple-double is the accumulation of a double-digit number total in all five categories in a game. Two quintuple-doubles have been recorded at the high school level, by Tamika Catchings and Aimee Oertner, but none have occurred in a college or professional game. A similar accomplishment is the five-by-five, which is the accumulation of at least five points, five rebounds, five assists, five steals, and five blocks in a game. In the