abstract：:The progeny of crosses between wild-type strains of Phycomyces usually do not exhibit all of the expected genotypes from meiosis. By backcrossing, we have isolated a new (+) mating-type strain, A56, which is nearly isogenic with the (-) wild-type NRRL1555 commonly used in Phycomyces research. Tetrad analysis of the ba...

journal_title：Genetics

authors： Alvarez MI,Eslava AP

更新日期：1983-12-01 00:00:00

abstract：:The wild-type Salmonella typhimurium strain LT2 contains six copies of the insertion sequence element IS200 which is unique to Salmonella. We have determined the chromosomal locations of all six copies of IS200 in strain LT2. This was done by mapping the positions of Tn10 elements inserted near each copy of IS200. Suc...

journal_title：Genetics

authors： Lam S,Roth JR

更新日期：1983-12-01 00:00:00

abstract：:The Sex-Ratio (SR) phenomenon is associated with the X chromosome of many species of Drosophila. Males carrying SR transmit predominantly sperm bearing the X chromosome. SR, therefore, has a very significant advantage in segregation. This paper provides an experimental analysis of the role of virility selection in pre...

journal_title：Genetics

authors： Wu CI

更新日期：1983-11-01 00:00:00

abstract：:To test genetic recombination in the vicinity of insertions of the transposon Tn5, crosses were performed by transduction between M. xanthus strains carrying different insertions of Tn5. One member of each pair carried resistance to kanamycin (Tn5-Km); the other carried resistance to tetracycline (Tn5-Tc). The distanc...

journal_title：Genetics

authors： Sodergren E,Cheng Y,Avery L,Kaiser D

更新日期：1983-10-01 00:00:00

abstract：:Two strains of Drosophila melanogaster derived from different geographical localities were subjected to selection for fast and slow developmental rate. Four enzyme polymorphisms were monitored for their response to such selection. Significant changes in allele frequencies were effected for the alphaGpdh and 6Pgd polym...

journal_title：Genetics

authors： Cavener DR

更新日期：1983-09-01 00:00:00

abstract：:Genetic and developmental analysis of an X-linked vital locus vnd was undertaken. Embryos hemizygous for the original allele vnd did not hatch and exhibited a disorganized ventral nervous system (VNS). The mutation maps in the region 1B6-7 to 1B9-10, a subregion of an area previously shown to be essential to normal ne...

journal_title：Genetics

authors： White K,DeCelles NL,Enlow TC

更新日期：1983-07-01 00:00:00

abstract：:Four species of the Hawaiian Drosophila planitibia subgroup which are homosequential in their polytene chromosomes are resident on the islands of Molokai, Maui and Hawaii. Comparisons of DNA sequence divergence in these four have been made by hybridization of total single-copy radiolabeled tracer DNA from each of the ...

journal_title：Genetics

authors： Hunt JA,Carson HL

更新日期：1983-06-01 00:00:00

abstract：:The evidence in support of two types of alternate disjunction in translocation heterozygotes from the German cockroach, Blattella germanica (L.), is reviewed. When unique cytomorphological features occur in the translocation figure, the two types of alternate disjunction are identifiable regardless of the angle of obs...

journal_title：Genetics

authors： Cochran DG

更新日期：1983-05-01 00:00:00

abstract：:Segregation distorter (SD) chromosomes are preferentially transmitted to offspring from heterozygous SD/SD(+) males owing to the induced dysfunction of the SD(+)-bearing sperm. This phenomenon involves at least two major loci: the Sd locus whose presence is necessary for distortion to occur and the Rsp locus which act...

journal_title：Genetics

authors： Brittnacher JG,Ganetzky B

更新日期：1983-04-01 00:00:00

abstract：:Mta is a cell surface antigen of the mouse and serves as a target for specific T killer lymphocytes. Using a killer cell assay, the antigen has been found in 72 strains of laboratory mice and, with one exception, in all tested samples of mice caught in the wild or bred from such, including Mus molossinus, Mus castaneu...

journal_title：Genetics

authors： Lindahl KF,Hausmann B

更新日期：1983-03-01 00:00:00

abstract：:Mathematical models are presented for the evolution of postmating and premating reproductive isolation. In the case of postmating isolation it is assumed that hybrid sterility or inviability is caused by incompatibility of alleles at one or two loci, and evolution of reproductive isolation occurs by random fixation of...

journal_title：Genetics

authors： Nei M,Maruyama T,Wu CI

更新日期：1983-03-01 00:00:00

abstract：:Two-dimensional paper chromatography was performed on methanol extracts of leaves of hexaploid bread wheat, Triticum aestivum L. em. Thell. cultivar Chinese Spring, and of the available nullisomic-tetrasomic compensating lines, the tetrasomic lines and the ditelocentric lines. The chromatograms had 27 spots identified...

journal_title：Genetics

authors： Neuman PR,Waines JG,Hilu KW,Barnhart D

更新日期：1983-02-01 00:00:00

abstract：:A new suppressor of +1 frameshift mutations has been isolated in Salmonella typhimurium. This suppressor, sufJ, maps at minute 89 on the Salmonella genetic map between the argH and rpo(rif) loci, closely linked to the gene for the ochre suppressor tyrU(supM). The suppressor mutation is dominant to its wild-type allele...

journal_title：Genetics

authors： Bossi L,Kohno T,Roth JR

更新日期：1983-01-01 00:00:00

abstract：:Mating behavior in adult male nematodes can be assayed by mating efficiency, i.e., the number of cross progeny sired by males under standard conditions. Mutant males from 220 strains, representing most of the known complementation groups of C. elegans, have been examined for mating efficiency and for anatomical abnorm...

journal_title：Genetics

authors： Hodgkin J

更新日期：1983-01-01 00:00:00

abstract：:The contribution of mismatch repair to genetic recombination in T4 phage has been evaluated by three independent approaches: (1) testing for non-additivity of recombinant frequencies; (2) measurements of double exchange frequencies in three-factor crosses: (3) comparisons of recombination abilities of mutations occupy...

journal_title：Genetics

authors： Shcherbakov VP,Plugina LA,Kudryashova EA,Efremova OI,Sizova ST,Toompuu OG

更新日期：1982-12-01 00:00:00

abstract：:Orientation disruptor (ord), a meiotic mutant that is recombination defective in females and disjunction defective in males and females, has been analyzed using serial section electron and light microscopy. From analysis of primary spermatocytes we have confirmed that ord males are defective in some aspect of the mech...

journal_title：Genetics

authors： Lin HP,Church K

更新日期：1982-12-01 00:00:00

abstract：:A newly identified gene is described that is required for the maintenance of normal identities in many of the body segments of the fly. The effects of mutants in this gene, which is called Polycomblike (Pcl), suggest that its wild-type allele functions in the regulation of the bithorax gene complex (BX-C) and the Ante...

journal_title：Genetics

authors： Duncan IM

更新日期：1982-09-01 00:00:00

abstract：:Populations of several co-existing species of Simocephalus were examined electrophoretically at 11 enzyme loci. The prevailing pattern was one of extensive allelic substitution between species and low levels of polymorphism (0-10%) within species. Genetic identity values between species were very low (10-50%). These r...

journal_title：Genetics

authors： Hann BJ,Hebert PD

更新日期：1982-09-01 00:00:00

abstract：:A lethal locus (l(2)br7;35B6-10), near Adh on chromosome arm 2L of D. melanogaster, is identified with Plunkett's dominant suppressor of Hairless (H). Of eight new alleles, seven act as dominant suppressors of H, the eighth is a dominant enhancer of H. One of the suppressor alleles is both a leaky lethal and a weak s...

journal_title：Genetics

authors： Ashburner M

更新日期：1982-07-01 00:00:00

abstract：:Abnormalities in chromosome number that occurred during meiosis were evaluated with a specially-constructed diploid strain of Saccharomyces cerevisiae. The strain is heterozygous for six markers of the right arm of chromosome V and heterozygous for cyh2 (resistance to cycloheximide) on chromosome VII.-Selection of mei...

journal_title：Genetics

authors： Sora S,Lucchini G,Magni GE

更新日期：1982-05-01 00:00:00

abstract：:Statistical tests of the neutrality hypothesis that are based on the sampling theory of Ewens (1972) require the assumption of panmixia. It is proposed that for a population comprising numerous local populations with weak gene flow among them, tests based on Ewens' theory can be applied separately to samples from each...

journal_title：Genetics

authors： Slatkin M

更新日期：1982-03-01 00:00:00

abstract：:Thirty-four independent nonviable c-locus mutations (types cal, albino lethal and cas, albino subvital), derived from radiation experiments, were tested for involvement of nearby markers tp, Mod-2, sh-1, and Hbb: 10, 22, and 2 involved, respectively, none of these markers, Mod-2 alone, and Mod-2 plus sh-1. When classi...

journal_title：Genetics

authors： Russell LB,Montgomery CS,Raymer GD

更新日期：1982-03-01 00:00:00

abstract：:According to the ratchet mechanism hypothesis, deleterious mutations should accumulate in clonal genomes of unisexual fish of the genus Poeciliopsis. This study defines one such mutant, a silent carboxylesterase allele (ES-5 degrees) which is found in the heterozygous condition in a particular population of P. monacha...

journal_title：Genetics

authors： Spinella DG,Vrijenhoek RC

更新日期：1982-02-01 00:00:00

abstract：:Intrachromosomal gene conversion is the non-reciprocal transfer of information between a pair of repeated genes on a single chromosome. This process produces eventual sequence homogeneity within a family of repeated genes. An evolutionary model for a single chromosome lineage was formulated and analyzed. Expressions w...

journal_title：Genetics

authors： Nagylaki T,Petes TD

更新日期：1982-02-01 00:00:00

abstract：:The K1 killer plasmid, [KIL-k1], of Saccharomyces cerevisiae is a 1.25 x 10(6) dalton linear double-stranded RNA plasmid coding for a protein toxin and immunity to that toxin. The [KIL-sd1] plasmid is a replication-defective mutant of [KIL-k1] that depends on one of the recessive chromosomal superkiller (ski-) mutatio...

journal_title：Genetics

authors： Wickner RB,Toh-e A

更新日期：1982-02-01 00:00:00

abstract：:Genic variation in natural populations of Drosophila simulans was surveyed using allozymic and two-dimensional electrophoretic techniques. Consistent with some previous reports, allozymic heterozygosity appeared lower than in the sibling species D. melanogaster (0.07 vs. 0.16). No variation was detected by two-dimensi...

journal_title：Genetics

authors： Ohnishi S,Leigh Brown AJ,Voelker RA,Langley CH

更新日期：1982-01-01 00:00:00

abstract：:This paper describes a perturbation experiment on the frequency of the F and S Alcohol dehydrogenase (Adh) alleles of D. melanogaster. Fifty-four iso-female lines set up from three wild populations and with initial F frequencies of either 0.25, 0.50 or 0.75 were maintained on standard laboratory food medium at 22 degr...

journal_title：Genetics

authors： Wilson SR,Oakeshott JG,Gibson JB,Anderson PR

更新日期：1982-01-01 00:00:00

abstract：:Several multilocus models that incorporate both preferential mating and viability selection are studied. Specifically, a class of symmetric heterozygosity models are considered that assign individuals to phenotypic classes according to which loci are in heterozygous state regardless of the actual allelic content. Othe...

journal_title：Genetics

authors： Karlin S,Raper J

更新日期：1982-01-01 00:00:00

abstract：:Forty-eight new mutations at the am locus of Neurospora crassa have been characterized. Nineteen mutations were induced by UV; of these, eight were missense, two were frameshifts, two were nonsense, three were deletions and four were unidentified. Twenty-nine mutations were induced with nitrous acid; of these, twenty-...

journal_title：Genetics

authors： Kinsey JA,Hung BS

更新日期：1981-11-01 00:00:00

abstract：:The results from a simulation model of selection, mutation and genetic drift in a geographically subdivided population are presented. The infinite-alleles mutation model of Kimura and Crow (1964) is asumed, and both advantageous and deleterious mutations are considered. It is shown that the average frequency of an all...

journal_title：Genetics

authors： Slatkin M

更新日期：1981-10-01 00:00:00

abstract：:Log-linear analysis of contingency tables is applied to trihybrid backcross data to estimate linkage and viability. Whereas nonadditive viability differences perturb recombination estimates in the classical analysis, this statistical procedure yields maximum likelihood crossover frequency estimates in the presence of ...

journal_title：Genetics

authors： Clark AG

更新日期：1981-09-01 00:00:00

abstract：:Isogenic lines, in which chromosomes sampled from natural populations of C. melanogaster are substituted into a common genetic background, were used to detect and partially characterize autosomal factors that affect the activities of the two pentose phosphate pathway enzymes, glucose 6-phosphate dehydrogenase (G6PD) a...

journal_title：Genetics

authors： Laurie-Ahlberg CC,Williamson JH,Cochrane BJ,Wilton AN,Chasalow FI

更新日期：1981-09-01 00:00:00

abstract：:In its hypermutable state, an unstable singed allele, sn(w), mutates in the germline to two other alleleic forms at a total frequency usually between 40 and 60%. In its stable state, the mutation rate of sn(w) is essentially zero. Its state depends on an extrachromosomal condition indistinguishable from a property cal...

journal_title：Genetics

authors： Engels WR

更新日期：1981-07-01 00:00:00

abstract：:The allozymic variation at at the esterase-6 locus examined in fourteen samples of natural populations of Drosophila simulans collected in two different localities. The samples were collected from different species of fruits in the two localities and from banana baits located some meters apart from the fruits. The ana...

journal_title：Genetics

authors： de Albuquerque CM,Napp M

更新日期：1981-06-01 00:00:00

abstract：:A wheat (Triticum aestivum L. emend Thell) disomic addition line (2n = 6x = 44), SH1-152-2, with a pair of Elytrigia pontica (Podp.) Holub 2n = 10x = 70 [syn. Agropyron elongatum (Host) P.B.] chromosomes controlling blue aleurone color was crossed with a short-statured spring wheat ;Sonora 64' (T. aestivum). Isoline p...

journal_title：Genetics

authors： Jan CC,Dvorák J,Qualset CO,Soliman KM

更新日期：1981-06-01 00:00:00

abstract：:Cornell Control White Leghorn chicks were grown in a common environment to five weeks of age and selected for fast and slow gain in body weight from five to nine weeks of age at two temperatures, 21.1 degrees (cold) and 32.2 degrees (hot), during which time a constant 50% relative humidity was maintained. All lines we...

journal_title：Genetics

authors： Bohren BB,Carson JR,Rogler JC

更新日期：1981-02-01 00:00:00

abstract：:A simple method of replica plating has been used to isolate mutants of Neurospora crassa that have increased sensitivity to methyl methanesulfonate (MMS) and/or to histidine. Twelve mutants with increased sensitivity to MMS and one mutant with increased sensitivity to histidine showed Mendelian segregation of the muta...

journal_title：Genetics

authors： Delange AM,Mishra NC

更新日期：1981-02-01 00:00:00

abstract：:A sib analysis of adult life-history characters was performed on about twelve hundred females from a laboratory Drosophila melanogaster population that had been sampled from nature and cultured so as to preserve its genetic variability. The following results were found. There was no detectable trend with age in additi...

journal_title：Genetics

authors： Rose MR,Charlesworth B

更新日期：1981-01-01 00:00:00

abstract：:Escherichia coli K12 does not metabolize beta-glucosides such as arbutin and salicin because of lack of expression of the bglBSRC operon, which contains structural genes for transport (bglC) and hydrolysis (bglB) of phospho-beta-glucosides. Mutants carrying lesions in the cis-acting regulatory site bglR metabolize bet...

journal_title：Genetics

authors： Defez R,De Felice M

更新日期：1981-01-01 00:00:00

abstract：:In some strains of Saccharomyces cerevisiae, the induction of enzymes of the Leloir pathway, galactose fermentation and growth on galactose depend on mitochondrial function; mitochondrial dependence is elicited through the recessive allele imp1 of the nuclear gene IMP1. The genetic element IMP1 is not allelic to any o...

journal_title：Genetics

authors： Algeri AA,Bianchi L,Viola AM,Puglisi PP,Marmiroli N

更新日期：1981-01-01 00:00:00