SUMMARYIn the Pan 4 isolate of Didymium iridis, a heterothallic line was spontaneously derived from an apomictic one. Genetical and cytological evidence shows that in the heterothallic state amoebal clones are self-sterile and cross-fertile, whereas in the apomictic condition each clone produces plasmodia without benefit of crossing.
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O’Neil Ray Collins (1980) studied this question.
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