Mitotic Chromosome Stability
Mitotic chromosome transmission was measured using the color colony assay of Hieter et al. (23). The wild-type diploid, MSY167, and the two histone deletion diploids, MSY164 and MSY165, were each transformed with the minichromosome plasmid pAB9SEG. Cells were grown for 4 h in YPD medium and then spread on complete synthetic medium containing a limiting amount of adenine at 2 rag/liter. The plates were incubaled at 28~ and then scored for colony color phenotype and sectonng.