Results 211 to 220 of about 42,068 (256)
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Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1977
Abstract Commonly accepted precepts are challenged : (1) that homologous chromosome pairing is normally mediated by nuclear envelope attachment sites; (2) that crossover site establishment awaits synaptic completion; and (3) that it is the function of the synaptonemal complex to hold homologues in register so that equal crossing over ...
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Abstract Commonly accepted precepts are challenged : (1) that homologous chromosome pairing is normally mediated by nuclear envelope attachment sites; (2) that crossover site establishment awaits synaptic completion; and (3) that it is the function of the synaptonemal complex to hold homologues in register so that equal crossing over ...
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A cytophotometric study of chromosome pairing
Chromosoma, 19561. Confirming earlier studies (Schrader 1945a and b), the chromosomes of the harlequin lobe of the testis of the pentatomid Loxa flavicolis are found to be asynaptic throughout late meiotic prophase and to divide equationally at metaphase I. All other lobes show a normal meiosis. 2.
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Mechanism of Chromosome Pairing during Meiosis
Nature, 1970Electron microscopy with whole mount preparations has revealed that the synaptonemal complex merely pulls two homologous chromosomes together. Intimate molecular pairing is another matter—probably brought about by connexions between short stretches of single stranded DNA.
D E, Comings, T A, Okada
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Chromosome Duplication and Pairing
1965The early cytologists came to the conclusion that in a majority of organisms the leptotene chromosomes were single and that this singleness persisted at least until pachytene. This, in turn, led to the idea that chromosome duplication occurred during pachytene and not, as in mitotic tissues, during interphase.
Bernard John, Kenneth R. Lewis
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Chromosome Pairing: Effect of Colchicine on an Isochromosome
Science, 1970Two separable stages in the process of chromosome pairing have been demonstrated. The first results in a close spatial relationship of homologs, and the second results in synapsis and formation of chiasmata. Colchicine reduces chiasma formation in conventional bivalents but not in an isochromosome.
C J, Driscoll, N L, Darvey
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Chromosome pairing in haploids of Brassica campestris
Theoretical and Applied Genetics, 1981The maximum chromosome pairing observed in haploids of Brassica campestris was two bivalents plus one trivalent but differences were observed in the chromosome pairing frequencies of the four haploids studied. This pairing supports the theorem that the species is hexasomic for one chromosome, tetrasomic for two and disomic for three others but it is ...
K C, Armstrong, W A, Keller
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THE PAIRING OF AN ALIEN CHROMOSOME WITH HOMOEOLOGOUS CHROMOSOMES OF WHEAT
Canadian Journal of Genetics and Cytology, 1972The homoeology of chromosome A of Triticum umbellulatum has been determined by studying its pairing relationships with wheat telocentrics in hybrids having the chromosome constitution of 20 wheat chromosomes + one wheat telocentric chromosome + seven Triticum speltoides chromosomes + chromosome A.
Raghbir S. Athwal, Gordon Kimber
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The meiotic pairing of nine wheat chromosomes
Theoretical and Applied Genetics, 1984The meiotic identification of nine pairs of chromosomes at metaphase I of meiosis of Triticum aestivum (B genome, 4A and 7A) has been achieved using a Giemsa C-banding technique. As a result, the analysis of the pairing of each chromosome arm in disomic and monosomic intervarietal hybrids between 'Chinese Spring' and the Spanish cultivar 'Pané 247 ...
E, Ferrer, J M, González, N, Jouve
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Centromere Associations in Meiotic Chromosome Pairing
Annual Review of Genetics, 2015Production of gametes of halved ploidy for sexual reproduction requires a specialized cell division called meiosis. The fusion of two gametes restores the original ploidy in the new generation, and meiosis thus stabilizes ploidy across generations.
da Ines, Olivier, White, Charles
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Meiotic segregation of a homeologous chromosome pair
Molecular Genetics and Genomics, 2003During meiosis, the alignment of homologous chromosomes facilitates their subsequent migration away from one another to opposite spindle poles at anaphase I. Recombination is part of the mechanism by which chromosomes identify their homologous partners, and serves to link the homologs in a way that, in some organisms, has been shown to promote proper ...
Maxfield Boumil, R. +4 more
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