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A cytoplasmically inherited mutation in the fungus Phycomyces blakesleeanus.

Fourteen mutants of the fungus Phycomyces blakesleeanus, showing high levels of resistance to copper, were isolated. In all the mutants, copper resistance behaved as a very variable and unstable trait. In the mutant strain MU102, the mutation was demonstrated to be cytoplasmically inherited. In addition, this mutant strain differed from the wild-type in growth, respiration rate, and shape and viability of spores.