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9. Spontaneous germination. Some genotypes result in spontaneous ascospore germination (for example, the unpigmented ascospores of per-1 Type I). A significant fraction of ascospores carrying fl (fluffy) germinate spontaneously, at least in some crosses. This becomes apparent when ascospores are aged after isolating tetrads. Off-ratios may result if fl ascospores break dormancy before heatshock and are therefore kill......阅读全文

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