SUMMARY Maternal 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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Rowlands et al. (1976) studied this question.
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