Allelic diversity at the het-c locus in Neurospora tetrasperma confirms outcrossing in nature and reveals an evolutionary dilemma for pseudohomothallic ascomycetes.

Abstract excerpt

Vegetative cells of the filamentous ascomycete Neurospora tetrasperma are typically heterokaryotic, possessing haploid nuclei of both A and a mating types. As a consequence, N. tetrasperma is self-fertile. This life cycle, referred to as pseudohomothallism, clearly derives from true heterothallism of the type exhibited by related species such as N. crassa. Occasional homokaryotic, single-mating-type...

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