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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 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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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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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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Sex-chromosome pairing and male fertility
Cytogenetic and Genome Research, 1974In this paper a hypothesis is presented which relates chromosome pairing and sterility in males. This hypothesis has been formulated on the basis of data from numerous meiotic systems in the male of <i>Drosophila melanogaster, </i>where the sex chromosomes have heterochromatic pairing sites, sites which must interact in order for ...
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Classifier-assisted metric for chromosome pairing
2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010Cytogenetics plays a central role in the detection of chromosomal abnormalities and in the diagnosis of genetic diseases. A karyogram is an image representation of human chromosomes arranged in order of decreasing size and paired in 23 classes. In this paper we propose an approach to automatically pair the chromosomes into a karyogram, using the ...
Rodrigo, Ventura +2 more
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Triple Chromosome Pairing in Triploid Chickens
Nature, 1971THE statement that “only two homologous chromosomes can pair at one time” is one of the most basic of cytogenetic principles. It is founded on observations of meiosis in triploid and tetraploid organisms1–7 which have suggested that if three homologues are present, they will occur as a pair and a single unpaired chromosome.
D E, Comings, T A, Okada
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Chromosome pairing and induced exchange in Drosophila
Mutation Research, 1965Abstract Fragments of Y chromosomes were induced by irradiating attached-X Drosophila melanogaster females carrying a doubly marked Y chromosome, and detected by loss of one of the Y markers. Slightly more than half of the 55 fragments recovered showed linkage of fourth chromosome markers, implying a high frequency of association of Y and fourth ...
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Efficient DNA pairing in a Neurospora mutant defective in chromosome pairing
Molecular and General Genetics MGG, 1991A Neurospora crassa mutation, mei-2, affecting recombination and pairing of homologous chromosomes during meiosis, was characterized for its effect on repeat-induced point mutation (RIP). We found that RIP, which depends on recognition of DNA sequence homology, is not inhibited by mei-2, suggesting that the defect in chromosome pairing of this mutant ...
H M, Foss, E U, Selker
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