Hybrids produced by protoplast fusion between auxotrophic mutants of the same strain contained the parental markers heterozygously, as indicated by induced mitotic segregation. Even within the same fusion combination the hybrids differed in their mitotic stability and their induced mitotic segregation pattern. The occurrence of aneuploids was proved. The ploidy of the hybrids did not exceed the diploid level in any case.
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Klinner et al. (1984) studied this question.
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