Fractionation
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This is a suite of mutational mechanisms that tend to remove one or the other homeologous gene derived from a tetraploidy, thus lowering gene content toward the preduplication ancestor. Fractionation is sometimes associated with chromosome breaks, large-scale rearrangements, centromere loss, centromere construction, and transposon mobilization. The mechanisms are not known in detail. This term is synonymous with diploidization when the term diploid is appropriate. (Freeling 2009)
