SUMMARYMaternal inheritance of extranuclear mitochondrial genes has been demonstrated in Aspergillus nidulans using the ‘blue’ ascospore colour mutants in combination with heterokaryon incompatible strains. It appears that heterokaryosis is not a prerequisite of sexual outcrossing, and that recombination of extranuclear mitochondrial markers does not occur in the sexual stage of the cell cycle.
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