abnormal rDNA separation abolished rDNA separation abolished ribosomal DNA separation abolished rDNA separation during mitosis A cellular process phenotype observed in the vegetative growth phase of the life cycle in which mitotic sister chromatid separation does not occur at the rDNA repeat regions. The remainder of the sister chromatids may or may not separate. abolished segregation of nucleolar rDNA FYPO:0004508 abolished mitotic sister chromatid separation at rDNA midori 2015-03-16T14:23:50Z abolished rDNA separation during vegetative growth abolished rDNA separation during mitotic cell cycle