Autotetraploid
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Incompatibility in Autotetraploid White Clover II. Dominance and Double Reduction
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14. Incompatibility in Autotetraploid Trifolium Repens L. I. Competition and Self-Compatibility
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15. Chromosome Differentiation and Pairing Behavior of Polyploids: An Assessment on Preferential Metaphase I Associations in Colchicine-Induced Autotetraploid Hybrids within the Genus Secale
Preferential chromosome association at metaphase I has been analyzed and compared in autotetraploid cells obtained by colchicine treatment of hybrid diploid rye plants with different degrees of chromosomal divergence between homologs. The tendency to identical over homologous, but not identical, pairing preferences detected when homologous partners are contr
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16. Analysis of pivotal-differential evolutionary patterns
The numerical analysis of meiosis in hybrids between a wild allotetraploid and an autotetraploid of one of its putative diploid progenitors allows the identification of which genomes are pairing and also the verification of pivotal-differential evolution. This type of analysis should be applicable to all genera in which allopolyploid series exist.
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17. Genomic analysis of diploid plants.
The numerical analysis of meiosis in the triploid hybrid between an induced autotetraploid and a related diploid provides the basis for investigations of the genomic relationships of diploid species based on chromosome pairing. It is also possible to make legitimate comparisons between different triploid hybrids of this type so that the genomic relationships
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18. Chloroplast DNA Variation in a Wild Plant, Tolmiea Menziesii
Few studies of cpDNA have provided evolutionary and/or phylogenetic information at the intraspecific level. We analyzed restriction site variation using 19 endonucleases in 37 populations representing both diploid (2n = 14) and autotetraploid (2n = 28) Tolmiea menziesii. Seven restriction site mutations and five length mutations were observed. Although diplo
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19. Theoretical basis for genetic linkage analysis in autotetraploid species
Linkage analysis in autotetraploid species has been an historical challenge in quantitative genetics theory and is a stumbling block that urgently needs to be removed in the rapidly emerging genome research on this species, such as cultivated potato. This article presents theory of a full model of tetrasomic linkage and develops a statistical framework for t
National Academy of Sciences.
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20. EVIDENCE FOR CONTROL OF THE RATE OF NUCLEAR DNA SYNTHESIS BY THE NUCLEAR MEMBRANE IN EUKARYOTIC CELLS*
Rates of DNA synthesis in root tip cells of diploid and autotetraploid snapdragon (Antirrhinum majus) seedlings and in diploid and tetraploid (mononucleate and bidiploid-nucleate) regenerating mouse-liver cells have been studied. The increase in this rate in the tetraploid cells is closely correlated with the increase in nuclear surface area, but not with th
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21. Mathematical Comparison of Homologous and Homoeologous Chromosome Configurations and the Mode of Action of the Genes Regulating Pairing in Wheat
Analyses of frequencies of chromosome configurations in wheat and wheat hybrids are extended to include data from hybrids of three chromosome-pairing mutants of wheat with Aegilops variabilis and from autotetraploid Triticum monococcum. These data confirm and extend the theory proposed by Driscoll, Bielig and Darvey (1979). Homoeologous and homologous chromo
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22. Correct Estimation of Preferential Chromosome Pairing in Autotetraploids
In recent work, a statistical model was proposed for the purpose of estimating parameters associated with quantitative trait locus (QTL) mapping and preferential pairing within a polyploidy framework. The statistical model contained several parameters that, when estimated from experimental data, supplied information about QTL, including a preferential pairin
Cold Spring Harbor Laboratory Press.
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23. Pairing Competition between Identical and Homologous Chromosomes in Autotetraploid Rye. I. Submetacentric Chromosomes
Meiotic pairing preferences between identical and homologous but not identical chromosomes were analyzed in ten induced tetraploid/diploid chimaeral rye plants (Secale cereale) heterozygous for telomeric heerochromatin C-bands in both arms of chromosome 1R. These plants were the progeny of two crosses between only one plant of cv. Petkus, used as male, and t
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24. Generating Autotetraploid Sporophytes and Their Use in Analyzing Mutations Affecting Gametophyte Development in the Fern Ceratopteris
The haploid gametophytes of the fern Ceratopteris richardii are autotrophic and develop independently of the diploid sporophyte plant. While haploid genetics is useful for screening and characterizing mutations affecting gametophyte development in Ceratopteris, it is difficult to assess whether a gametophytic mutation is dominant or recessive or to determine