FIG 2.

Spore killing in select ascomycetes. In all images, the spore-killing haplotype is indicated with a yellow star. (A) A spore killer showing a first-division segregation pattern in Podospora anserina. This spore killer would destroy the two spores that do not inherit the killer haplotype regardless of the particular mechanism (i.e., killer-target or poison-antidote). (B) A spore killer showing a second-division segregation pattern in Podospora anserina. If this spore killer employs a killer-target mechanism, all spores would be destroyed (not shown) as each inherits the spore-killing haplotype (star) and the alternate allele that contains the target. If this spore killer employs a poison-antidote mechanism, all spores would survive (as shown) because each would receive the antidote. (C and D) Spore killing in Neurospora intermedia (C) and Schizosaccharomyces pombe (D), where half the spores are destroyed by a fully penetrant spore killer, regardless of mechanism.