The process due to which allopolyploids behave like diploid only in bivalent formation is

The process due to which allopolyploids behave like diploids only in bivalent formation is Diploidization.
Diploidization is the process of converting a polyploid genome back into a diploid one.
It involves many changes in genome organization that ultimately restore bivalent chromosome pairing and disomic inheritance, and resolve dosage and other issues caused by genome duplication.