Summary
Crosses involving mitochondrial markers conferring resistance to antimycin (anar, AR), chloramphenicol (capr, CR), and erythromycin (eryr, ER) in cis- and trans-configuration were studied by zygote clone analysis. Mutant ana r-8 from which all other drug-resistant isolates were derived, exhibits a highly biased transmission (6.8% ana r), in an analysis of 100 individual zygote clones. Important results of zygote clone analyses were:
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- Zygote clones may contain one, two, three, or four mitochondrial genotypes.
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- The proportion of the two parental and the two recombinant genotypes in individual zygote clones can vary almost over the entire range of percentages.
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- Proportions of the two corresponding recombinant types in individual clones are usually unequal.
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- Transmission rates of markers are higher in trans-than in cis-crosses indicating additivity of bias by two mutated alleles in coupling.
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- Transmission rates are different for the three markers both in cis- and trans-crosses, being lowest for C Rand highest for E R.
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- Up to more than 80% uniform clones, expressing only one genotype, can be produced in cis- and trans-crosses. In cis-crosses always the double-sensitive parental type becomes uniform, in trans-crosses this may be the case for parental and/or recombinant genotypes.
A tentative map is presented using data from cis- and trans-crosses, including a correction by omission of uniform clones. Phenomena of transmission, segregation, and formation of uniform clones are discussed with special regard to the difference brought about by fission versus budding.
A comparison with relevant data from Saccharomyces cerevisiae and other organisms is presented.
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Communicated by W. Gajewski
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Seitz-Mayr, G., Wolf, K. & Kaudewitz, F. Extrachromosomal inheritance in Schizosaccharomyces pombe . Molec. Gen. Genet. 164, 309–320 (1978). https://doi.org/10.1007/BF00333162
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DOI: https://doi.org/10.1007/BF00333162