Polyploids
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Rapid genome change in synthetic polyploids of Brassica and its implications for polyploid evolution.
Although the evolutionary success of polyploidy in higher plants has been widely recognized, there is virtually no information on how polyploid genomes have evolved after their formation. In this report, we used synthetic polyploids of Brassica as a model system to study genome evolution in the early generations after polyploidization. The initial polyploids
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14. Polyploid formation created unique avenues for response to selection in Gossypium (cotton)
A detailed restriction fragment length polymorphism map was used to determine the chromosomal locations and subgenomic distributions of quantitative trait loci (QTLs) segregating in a cross between cultivars of allotetraploid (AADD) Gossypium hirsutum (“Upland” cotton) and Gossypium barbadense (“Sea Island,” “Pima,” or “Egyptian” cotton) that
The National Academy of Sciences.
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15. Paralogs in Polyploids: One for All and All for One?
American Society of Plant Biologists.
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16. Cytological Studies on Polyploids Derived from Tetraploid Fragaria Vesca and Cultivated Strawberries
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17. Meiotic Chromosome Behavior in Species, Species Hybrids, Haploids, and Induced Polyploids of Gossypium
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18. Tetraodon genome confirms Takifugu findings: most fish are ancient polyploids
The genome of Tetraodon nigroviridis confirms that ray-finned fish underwent an acient whole-genome duplication.
BioMed Central.
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19. Cytogenetic evidence for asexual evolution of bdelloid rotifers
DNA sequencing has shown individual bdelloid rotifer genomes to contain two or more diverged copies of every gene examined and has revealed no closely similar copies. These and other findings are consistent with long-term asexual evolution of bdelloids. It is not entirely ruled out, however, that bdelloid genomes consist of previously undetected pairs of seq
National Academy of Sciences.
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20. 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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21. Hybridization and Polyploidization of Saccharomyces cerevisiae Strains by Transformation-Associated Cell Fusion
Hybrid or polyploid clones of Saccharomyces cerevisiae produced by protoplast fusion were easily isolated by selecting transformants with the plasmid phenotype because the transformation was directly associated with cell fusion. When haploid cells were used as the original strain, the transformants were mostly diploids with a significant fraction of polyploi
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22. Polyploidy alters advertisement call structure in gray treefrogs.
Whole-genome duplication is believed to have played a significant role in the early evolution and diversification of vertebrate animals. The establishment of newly arisen polyploid lineages of sexually reproducing animals requires assortative mating between polyploids. Here, we show that genome duplication can directly alter a phenotypic trait mediating mate
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23. Origins, colonization, and lineage recombination in a widespread perennial soybean polyploid complex
Polyploidy is a dominant feature of flowering plant genomes, including those of many important crop species, implying that polyploidy confers evolutionary advantages on plant species. Recent molecular studies suggest that polyploids often originate many times from the same progenitor diploids. For this to provide a broader genetic base for a polyploid specie
The National Academy of Sciences.
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24. STUDIES OF ISOZYME PATTERNS IN NULLISOMIC-TETRASOMIC COMBINATIONS OF HEXAPLOID WHEAT*
Thirty-eight wheat strains, each nullisomic for one chromosome and tetrasomic for a homoeologous (related) one, were analyzed electrophoretically for 12 different enzymes, and a gene (or genes) for alkaline phosphatase was localized to chromosomes 4B and 4D. The other 11 enzymes showed no significant electrophoretic variation. The fact that the only mutants