Fig. 1. Occurrence of meiotic divisions after induction of sporulation in diploid wild-type (2n WT), tetraploid (4n) and sir3 diploid (2n (sir3)), and in sir3 spo13 haploid (1n (sir3)) SK1 strains. Bi- and tetranucleated cells (100-200 per time point) were scored as divisions at the indicated time points in sporulation medium (SPM). The diploid and tetraploid time courses are given as the mean (±S.D.) of three experiments. Meiosis in diploid wild-type SK1 progresses significantly faster than in the tetraploid strain. Divisions in the sir3 spo13 haploid and sir3 diploid occur at similar times after induction of meiosis and are delayed with respect to diploid wild-type meiosis.

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