Figure 7.
The mitotic spindle checkpoint is activated in spi1-25 cells. (A) Serial dilution patch tests (104 to 101 cells) show growth of mph1Δ and spi1-25 single mutants and spi1-25 mph1Δ double mutant at 25°C on rich medium for 4 d. The strains all come from the same tetrad. (B) Diagrammatic representation of chromatin missegregation in the strains described in A. Cells were grown at 30°C for 12 h and fixed, and the chromatin was analyzed by staining with DAPI. Given are the percentages for the various abnormal chromatin segregation phenotypes in an asynchronously growing cell population. n.o., not observed.