Triploidy
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Karyotypic conservatism in samples of Characidium cf. zebra (Teleostei, Characiformes, Crenuchidae): physical mapping of ribosomal genes and natural triploidy
Basic and molecular cytogenetic analyses were performed in specimens of Characidium cf. zebra from five collection sites located throughout the Tietê, Paranapanema and Paraguay river basins. The diploid number in specimens from all samples was 2n = 50 with a karyotype composed of 32 metacentric and 18 submetacentric chromosomes in both males and females. Co
Genetics and Molecular Biology. Publicado em: 25/03/2011
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2. Avaliação de cultivares e híbridos de bananeira em quatro ciclos de produção.
Híbridos superiores de bananeira com alta produtividade, frutos vistosos e resistência a doenças estão sendo gerados no programa de melhoramento genético da Embrapa-Centro Nacional de Pesquisa de Mandioca e Fruticultura Tropical. Este trabalho objetivou avaliar alguns desses genótipos em quatro ciclos de produção, visando sua recomendação aos agric
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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3. Cytotaxonomy, heterochromatic polymorphism and natural triploidy of a species of Astyanax (Pisces, Characidae) endemic to the Iguaçu river basin
Análises citogenéticas em Astyanax sp. D evidenciaram 2n=50 cromossomos e um cariótipo com 2M+26SM+6ST+16A. O bandamento C destacou as regiões teloméricas de diversos cromossomos SM-ST-A. Dois pares de cromossomos acrocêntricos possuem heterocromatina intersticial, sendo este estado polimórfico decorrente de prováveis inversões paracêntricas. O res
Brazilian Archives of Biology and Technology. Publicado em: 2007-01
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4. Natural triploidy in Leporinus cf. elongatus bearing sex chromosomes
Although several cases of natural triploidy in fish have already been described, spontaneous polyploidy in species with differentiated sex chromosomes are rare. We report the occurrence of a triploid fish (3n = 81) Leporinus cf. elongatus, a species characterized by a highly differentiated ZZ/ZW sex chromosome system, from the São Francisco river. The occur
Genetics and Molecular Biology. Publicado em: 2007
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5. Meiosis in elephant grass (Pennisetum purpureum), pearl millet (Pennisetum glaucum) (Poaceae, Poales) and their interspecific hybrids
The cultivated and sexually compatible species Pennisetum purpureum (elephant grass, 2n = 4x = 28) and Pennisetum glaucum (pearl millet, 2n = 2x = 14) can undergo hybridization which favors the amplification of their genetic background and the introgression of favorable alleles into breeding programs. The main problem with interspecific hybrids of these spec
Genetics and Molecular Biology. Publicado em: 2006
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6. Triploidy arising from a first meiotic non-disjunction in a mother carrying a reciprocal translocation.
We report on a 22 year old mother, a carrier of a 6;14 balanced reciprocal translocation, who aborted a triploid conceptus carrying a similar translocation. We showed the maternal origin of this triploidy, after non-disjunction at meiosis I. The phenotypic expression as a non-molar pregnancy, the contribution of the maternal translocation, and possible aetio
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7. Triploidy with cyclopia and identical HLA alleles in the parents.
A 22-week pregnancy was terminated after discovery of serious echographic abnormalities. Fetal examination showed cyclopia, sacral meningocele, and syndactyly. The karyotype was 69,XXX. The parents had identical HLA alleles A1, A2, and Bw21. The mechanism of the triploidy was determined by chromosome marker analysis to be digyny. The association of triploidy
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8. Sex chromatin and the biological effects of triploidy.
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9. Triploidy (and Haploidy) in the Newt, Triturus Viridescens, Induced by Refrigeration of Fertilized Eggs
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10. Clinical details, cytogenic studies,and cellular physiology of a 69, XXX fetus, with comments on the biological effect of triploidy in man.
A triploid fetus, 69, XXX, aborted spontaneously at 26 weeks' gestation. It had multiple abnormalities including syndactyly of the hands and feet single palmar creases, hypoplasia of the adrenals and ovaries, hypertrophy of thigh muscles, and abnormalities of the brain. The placenta was large and showed hydatidiform degeneration. The pregnancy had been compl
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11. Molecular Genotyping of Hydatidiform Moles : Analytic Validation of a Multiplex Short Tandem Repeat Assay
Distinction of hydatidiform moles from non-molar (NM) specimens, as well as their subclassification as complete (CHM) versus partial hydatidiform moles (PHM), is important for clinical management and accurate risk assessment for persistent gestational trophoblastic disease. Because diagnosis of hydatidiform moles based solely on morphology suffers from poor
American Society for Investigative Pathology.
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12. Functional Interactions of Neurogenic Genes of Drosophila Melanogaster
The neurogenic genes of Drosophila melanogaster are involved in the decision of ectodermal cells to take on a neural or an epidermal fate. We present evidence in support of the notion that six of the neurogenic genes are functionally related. We studied the phenotype of embryos lacking one of the neurogenic genes in the presence of an increased dosage of the