abnormal rDNA copy number decreased rDNA copy number during vegetative growth FYPO:0006494 decreased copy number of rDNA repeats during mitotic cell cycle A physical cellular phenotype observed in the vegetative growth phase of the life cycle in which the number of ribosomal DNA (rDNA) repeats present in the rDNA arrays on chromosome III is significantly lower than the range in wild type cells. shortened rDNA during vegetative growth midori 2018-04-09T15:44:54Z decreased rDNA copy number during mitotic cell cycle decreased copy number of rDNA repeats decreased ribosomal DNA copy number during vegetative growth