abnormal mitotic sister chromatid segregation chromosome loss during mitotic chromosome segregation A chromosome segregation phenotype observed in the vegetative growth phase of the life cycle in which one or more chromosome or minichromosome is not correctly segregated to either daughter cells during mitosis. chromosome loss during segregation during vegetative growth FYPO:0000227 midori chromosome segregation defects, chromosome loss 2011-04-19T02:59:38Z chromosome loss during mitotic sister chromatid segregation