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Showing 1 to 20 of 149 for “"haploid"”.
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Haploid reporter screens aimed at identification of NF-kappaB regulators
… a pathway is the forward genetic screen. Human haploid genetic screens represent a recent advance in this approach. I have attempted to expand the utility of human haploid genetic screens through the use of transcriptional reporters and developed human haploid reporter screens for the specific …
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OVERT AND LATENT PATHWAYS OF POLARITY SPECIFICATION IN ZYGOTES: THE HAPLOID-TO-DIPLOID TRANSITION
… of each mitotic cell cycle. The transition from haploid to diploid states involves complex signal transduction cascades, leadingto cell cycle arrest, chemotropic polarized growth, cell-cell fusion and nuclear fusion, culminating in zygote formation. Following substantial remodeling of the cell …
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A Study of the Relationship Between the Pronephros and the Haploid Syndrome in Frog Larvae
Made available in DSpace on 2014-12-04T22:46:06Z (GMT). No. of bitstreams: 1 5805479.pdf: 1778561 bytes, checksum: 8fee0317930758d637d9f6d373de261a (MD5) Previous issue date: 1958
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Using spontaneous haploid genome doubling to access favorable alleles in exotic maize (Zea mays L.) germplasm
… of US Corn Belt germplasm. The in vivo doubled haploid (DH) technology is widely used into exotic germplasms because it has a great promise in purging mutational load of deleterious recessive alleles. Accounting for all the improvements of DH production over the years, genome duplication is …
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The Potential for Green Fluorescent Protein as a Screening Tool in the Production of Haploid Potato Plants
… diploid clone (BARD 1-3) of Solanum phureja and haploid inducer IVP 101 was transformed with Agrobacterium tumefaciens strain 4404 containing plasmid pHB2892 with genes for green florescent protein (GFP) and kanamycin resistance. Hemizygous primary transformants (To) were produced from three leaf …
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The Search for Modifiers of the Maze Gametophyte Factor Ga1-s and Quantitative Trait Polymorphisms Emerging from Doubled-Haploid Maize Lines
… lines that have descended from a single doubled-haploid B73 plant. The objectives were (1) to search for modifier genes and loci on the maize chromosomes for the trait and determine genetic effects of them using QTL mapping; (2) to demonstrate the heritable polymorphism of the quantitative traits …
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Efficient production of doubled haploid plants through antimicrotubule agent treatment of anther-derived maize callus and the RFLP analysis of the maize anther culture response
… chromosome doubling of maize anther-derived haploid callus before plant regeneration. Without treatment with these agents, all the plants regenerated from the callus were haploid. More than 50% of the plants regenerated from the callus treated with 0.625 or 1.25 uM colchicine for 1 to 3 days, …
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AFLP Marker Analysis Of Monoploid Potato
Potato haploids have been recent components in protoplast fusion research, strategies to combine wild and cultivated potato germplasm and the generation of economically valuable mutant phenotypes. Additionally, most major genetic mapping and QTL analyses in potato have utilized haploid germplasm to …
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Studies of in vitro flowering and de novo flowers of Nicotiana tabacum
… of diploid (2n=4x=48) N. tabacum 'Samsun' and haploid (2n=2x=24) plants derived from 'Samsun' anther culture, major morphological differences were found. Flower and anther sizes were reduced in de novo flowers and the numbers of anthers and pistils produced per flower were variable. TCLs from …
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Correlated evolution in experimental populations of yeast
Replicate haploid and diploid lineages of the yeast <italic>Saccharomyces cerevisiae</italic>, selected for ∼5000 generations in a glucose-limited environment, were used to study correlations among life-history traits and fundamental questions about phenotypic evolution. As expected, growth …
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Reproductive Morphology and Spermatogenesis in <em>Demanyssus gallinae</em> (Degeer) (Mesostigmata: Dermanyssidae)
… protonymphal testicular arms) and formation of haploid (n=3) spermatids from haploid (n=3) spermatogonial cells is entirely mitotic. Spermatogenesis begins within one hour after protonymphal feeding and continues through adult ecdysis in normally fed individuals. Nutritional deficit causes …
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Correlations Between Electron Microscopic and Classical Analytic Observations of Three Strains of Temperature-Sensitive Male Sterility Mutants of <em>Drosophila melanogaster</em>.
… the assembly of cellular components into haploid gametes. It is directed, presumably, by the sequential activation and repression of genes.
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Derivation and Comparison of Androgenic and Gynogenic Monoploid Potato Families
… culture or maternally through crossing with a haploid-inducing pollinator. Evidence from other genera suggests that androgenic and gynogenic haploid populations derived from the same parent may differ due to gametic selection and/or epigenetic factors. Our objectives were to derive androgenic …
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The genomic and genetic basis of mammalian sexual reproduction : sequence of the mouse Y chromosome, and a gene regulatory program for meiotic prophase
… sexual differentiation, and the production of haploid gametes. In this thesis, I examined the genomic evolution of the mouse Y chromosome, which instructs sexual determination, and genetic regulation of a program of gene expression for meiosis, a specialized cell cycle which gives rise to …
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Asymptotic Analysis of Some Stochastic Models from Population Dynamics and Population Genetics
… time Markov chain model of allele frequencies in haploid populations of fixed size with the density dependent models of ecological competition of Lotka, Volterra, Gause, and Kolmogorov. This allows for haploid populations of stochastically varying – but bounded – size. Populations are kept finite …
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Genetic strategies to manipulate meiotic recombination in Arabidopsis thaliana
During meiosis eukaryotes produce four haploid gametes from a single diploid parental cell. In meiotic S-phase homologous chromosomes, which were inherited from maternal and paternal parents, are replicated. Homologous chromosomes then pair and undergo reciprocal crossover, which generates new …
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Genetic analysis of tissue culture responses in barley (Hordeum vulgare L.).
… in vitro culture response; and to use the double haploid (DH) lines derived from the cross between responsive and unresponsive parental lines to confirm the location of previously reported QTL that control barley tissue response and search for additional QTL in a different DH population.
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Zur Transkriptions- und Translationskontrolle des Gens für Transitionsprotein
… region which could direct the testis- and haploid-stage specific expression of the Tnp2 gene, a region of -74 to +70 was alyzed in transgenic mice. Earlier results revealed that a 565 bp 5"UTR can direct tissue- and ime-specific expression of Tnp2 gene in transgenic mice. The region was …
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Transcriptomic Insights into the Diplontic Life History of Diatoms
… strongly suggests that it is a vegetatively haploid organism, and the presence of several meiosis-specific genes indicate that it is likely capable of sexual reproduction as well. These results suggest that Bolidomonas represents the haploid phase of a haplodiplonitic life cycle, in which …
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