Meiotic Mutation
Mostrando 1-12 de 257 artigos, teses e dissertações.
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1. ‘URS Campestre’ seedless orange: a new mutant with female sterility
ABSTRACT: Seedlessness in fruit is a trait that is much sought after by juice making industries. Close to the city of São Sebastião do Caí, in the state of Rio Grande do Sul (RS), Brazil, a new mutant orange originating from natural mutation was identified and selected as a seedless material. To determine the mechanisms involved in the absence of seeds, t
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-10
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2. An original meiotic mutation in Paspalum regnellii.
1997
Sex Plant Reproduction. Publicado em: 2011
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3. Chromosome stickiness in meiosis of a brazilian Paspalum accession.
Citogenetic studies carried out over a period of 2 consecutive years on a still unidentified Brazilian accession of Paspalum (BRA-014176) revealed a meiotic mutation causing chromose stickiness in microsporogenis. In all inflorescences collected in both years, meiosis was normal until diakinesis. Chromosome stikiness became evident from metaphase I, whwn the
Cytologia. Publicado em: 2011
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4. Evolutionary aging models: reproductive regimes and the Y chromosome degeneration. / Modelos evolucionários de envelhecimento: regimes reprodutivos e a degeneração do cromossomo Y.
Aging theories can be classified in two types: biochemical theory and evolutionary theory. The biochemical theories explain ageing due to imperfections on the biochemical process responsible for the maintenance of life. The evolutionary theories explain aging without any biochemical mechanisms. They support only adaptive strategies, such as reproduction, her
Publicado em: 2003
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5. Recombinationless meiosis in Saccharomyces cerevisiae.
We have utilized the single equational meiotic division conferred by the spo13-1 mutation of Saccharomyces cerevisiae (S. Klapholtz and R. E. Esposito, Genetics 96:589-611, 1980) as a technique to study the genetic control of meiotic recombination and to analyze the meiotic effects of several radiation-sensitive mutations (rad6-1, rad50-1, and rad52-1) which
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6. Analysis of Meiotic Recombination Pathways in the Yeast Saccharomyces Cerevisiae
In the yeast, Saccharomyces cerevisiae, several genes appear to act early in meiotic recombination. HOP1 and RED1 have been classified as such early genes. The data in this paper demonstrate that neither a red1 nor a hop1 mutation can rescue the inviable spores produced by a rad52 spo13 strain; this phenotype helps to distinguish these two genes from other e
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7. Morewright (Mwr), a New Meiotic Mutant of Drosophila Melanogaster Affecting Nonexchange Chromosome Segregation
A new meiotic mutation, morewright (mwr) was identified by screening for new mutations that act as dominant enhancers of the dosage-sensitive Drosophila melanogaster female meiotic mutant, nod(DTW). mwr is a recessive meiotic mutant, specifically impairing the segregation of nonexchange chromosomes. Cytological evidence suggests that the meitoic defect in mw
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8. Xrs2, a DNA Repair Gene of Saccharomyces Cerevisiae, Is Needed for Meiotic Recombination
The XRS2 gene of Saccharomyces cerevisiae has been previously identified as a DNA repair gene. In this communication, we show that XRS2 also encodes an essential meiotic function. Spore inviability of xrs2 strains is rescued by a spo13 mutation, but meiotic recombination (both gene conversion and crossing over) is highly depressed in spo13 xrs2 diploids. The
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9. Genetic and Physical Analysis of the M26 Recombination Hotspot of Schizosaccharomyces Pombe
The ade6-M26 mutation of Schizosaccharomyces pombe has previously been reported to stimulate ade6 intragenic meiotic recombination. We report here that the ade6-M26 mutation is a single G -> T nucleotide change, that M26 stimulated recombination within ade6 but not at other distant loci, and that M26 stimulated meiotic but not mitotic recombination. In addit
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10. Me14, a Yeast Gene Required for Meiotic Recombination
Mutants at the MEI4 locus were detected in a search for mutants defective in meiotic gene conversion. mei4 mutants exhibit decreased sporulation and produce inviable spores. The spore inviability phenotype is rescued by a spo13 mutation, which causes cells to bypass the meiosis I division. The MEI4 gene has been cloned from a yeast genomic library by complem
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11. The Role of the SPO11 Gene in Meiotic Recombination in Yeast
Several complementary experimental approaches were used to demonstrate that the SPO11 gene is specifically required for meiotic recombination. First, sporulating cultures of spo11-1 mutant diploids were examined for landmark biochemical, cytological and genetic events of meiosis and ascosporogenesis. Cells entered sporulation with high efficiency and showed
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12. The Schizosaccharomyces Pombe Rec16 Gene Product Regulates Multiple Meiotic Events
Previously isolated meiotic recombination (rec) mutants of Schizosaccharomyces pombe define 16 complementation groups. The rec genes cloned and sequenced to date reveal little amino acid sequence identity to other reported proteins. We examined the rec mutants for alterations in meiotic events other than recombination to gain insight into the rec gene functi