Paramecium aurelia
MUTATIONAL ANALYSIS OF MATING TYPE INHERITANCE IN SYNGEN 4 OF PARAMECIUM AURELIA
... Six genic mutations restricting clones to mating type VI1 (0) were isolated in syngen 4, Paramecium aurelia.. The only three extensively tested were neither allelic nor c[r] ...
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Correlation between thermotolerance and membrane properties in Paramecium aurelia
... of Paramecium aurelia (Sonneborn, 1957) was isolated from a mountain stream near a hot spring in Nara Prefecture, Japan (Przybos et ...P. aurelia were stocks established at the Polish Academy of ...
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THE INDUCTION OF MUTATIONS IN PARAMECIUM AURELIA BY BETA RADIATION
... The relation of the percentage of exautogamous clones of reduced vigor to dose shows that most of the mutational changes cannot be gene mutations with individually detectable[r] ...
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A STUDY OF SOME PROPERTIES OF THE CYTOPLASMIC FACTOR, "KAPPA," IN PARAMECIUM AURELIA, VARIETY 2
... At any time, the particles of kappa may be classified into two categories: (1) particles which will give rise to new particles a t a certain net rate of increase, and ([r] ...
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THE DIVERSE MATE-KILLERS OF PARAMECIUM AURELIA, VARIETY 8: THEIR INTERRELATIONS AND GENETIC BASIS
... In table 1 are given only the results of crosses in which the mate-killers of stock 130, grown previously at different fission rates, were mating type XV.. Similar resu[r] ...
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ANTIGEN VARIATION IN PARAMECIUM AURELIA, VARIETY 1
... SONNEBORN (19SOb), that the specificity of some antigens was under strict gene control. Breeding tests showed that this differ- ence was controlled by a single gen[r] ...
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ESTERASE VARIATIONS BETWEEN THE 14 SYNGENS OF PARAMECIUM AURELIA UNDER AXENIC GROWTH
... The following kinds of tests of the new stocks listed in Table 1 were made: (1) the esterases of each stock were compared with those of all other stocks in the same syngen[r] ...
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Calcium channel stability measured by gradual loss of excitability in pawn mutants of Paramecium aurelia
... After just a single division cells at the '2-cell stage' - 18-25 n post-autogamy the behaviour of the pawn paramecia type 2, and see Table 2, fourth footnote could be distinguished from [r] ...
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FACTORS DETERMINING CONJUGATION IN PARAMECIUM AURELIA I. THE CYCLICAL FACTOR: THE RECENCY OF NUCLEAR REORGANIZATION
... If two mass cultures are set up a t the same time, in the way above described, one containing animals from isolation lines that have recently undergone endomixis or conjug[r] ...
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GENETIC CHANGES INDUCED BY EXPOSURE TO NITROGEN MUSTARD AND THEIR INHERITANCE IN PARAMECIUM AURELIA, VARIETY 4
... Surviving clones from a sample of 50 autogamous animals from an affected clone (0.440 reduced viability a t the first autogamy) which had been derived from an animal subje[r] ...
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FACTORS DETERMINING CONJUGATION IN PARAMECIUM AURELIA III. A GENETIC FACTOR: THE ORIGIN AT ENDOMIXIS OF GENETIC DIVERSITIES
... This was shown by the fact that conjugation as a rule occurred in the first two days of the culture, when other individuals were undergoing endomixis; and the conjugan[r] ...
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DEPENDENCE OF THE KAPPA PARTICLES OF STOCK 7 OF PARAMECIUM AURELIA ON A SINGLE GENE
... Stock B197, which has mutant trichocysts caused by a single recessive gene, the tr gene (PREER 1959), was crossed with stock 7 killers to obtain animals con- taining both ka[r] ...
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MATING TYPE MUTATIONS IN VARIETY 1 OF PARAMECIUM AURELIA, AND THEIR BEARING UPON THE PROBLEM OF MATING TYPE DETERMINATION
... Two mutant stocks of variety 1, pure for the odd mating type (I) have been analysed and shown to contain an allele of the mtl gene previously known to restrict stock P of [r] ...
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GENIC MUTANTS WITH ALTERED SYSTEM OF EXCITATION IN PARAMECIUM AURELIA. II. MUTAGENESIS, SCREENING AND GENETIC ANALYSIS OF THE MUTANTS
... Since Paranoiac F, clones segregated out of the crosses with the phenotypically Fast-2 parents in the statistically acceptable 2:l:l (Fast-2 : wild type : Paranoiac) ratio, it[r] ...
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REGULAR CHANGES IN MATING TYPE COMPOSITION IN SELFING CULTURES AND IN MATING TYPE POTENTIALITY IN SELFING CARYONIDES OF PARAMECIUM AURELIA
... Which pattern of change a given caryonide mani- fested was related to the cytoplasmic mating type-determining state of the parent of the caryonide in the same fashion as were the ch[r] ...
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BEHAVIOR OF NUCLEI AT CONJUGATION IN PARAMECIUM AURELIA. I. EFFECT OF INCOMPLETE CHROMOSOME SETS AND COMPETITION BETWEEN COMPLETE AND INCOMPLETE NUCLEI
... A number of explanations of this observation can be suggested, and several examples will be given here: (1) no nucleus reaches the cone, but a t least one outside the cone surv[r] ...
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EVIDENCE AGAINST MICRONUCLEAR MUTATIONS AS THE SOLE BASIS FOR DEATH AT FERTILIZATION IN AGED, AND IN THE PROGENY OF ULTRA-VIOLET IRRADIATED, PARAMECIUM AURELIA
... High mortality among the BC clones of irradiated ancestry could be the result of induced lethal mutations becoming homozygous a t cytogamy, and would account for the normal me[r] ...
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BEHAVIOR OF NUCLEI AT CONJUGATION IN PARAMECIUM AURELIA. II. THE EFFECTS OF X-RAYS ON DIPLOID AND HAPLOID CLONES, WITH A DISCUSSION OF DOMINANT LETHALS
... I t appears from their brief account that complete failure of gamete nuclei from the irradiated mate (similar to the pairs on line 6 of table 1) was more common with ultravi[r] ...
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AN IMMUNOLOGICAL AND GENETIC ANALYSIS OF ANTIGEN 5 IN PARAMECIUM AURELIA, SYNGEN 2
... This result indicates that the B197 qualitative and quan- titative alleles are dominant to those in stock 9 (see DISCUSSION). One hundred postautogamous lines were analyzed for an[r] ...
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Factors Determining the Frequency of the Killer Trait Within Populations of the Paramecium aurelia Complex
... As explained below, these proportions will be determined by the relative Dar- winian fitnesses of sensitives and killers, the rate of spontaneous loss of kappa from th[r] ...
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