Results 281 to 290 of about 2,401,068 (320)

Classifier-assisted metric for chromosome pairing

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010
Cytogenetics 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, Artem, Khmelinskii, J, Sanches   +2 more
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To pair or not to pair: chromosome pairing and evolution

Current Opinion in Plant Biology, 1998
Chromosome pairing in wild-type wheat closely resembles the process in both yeast and Drosophila. The recent characterisation of a mutant Ph1 wheat and the observation that chromosome pairing in the absence of Ph1 more closely resembles that of mammals and maize has shed light on the evolution of chromosome pairing in the cereals.
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Chromosome Duplication and Pairing

1965
The 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 ends initiate homologous chromosome pairing during rice meiosis

Plant Physiology
Abstract During meiotic prophase I, chromosomes undergo large-scale dynamics to allow homologous chromosome pairing, prior to which chromosome ends attach to the inner nuclear envelope and form a chromosomal bouquet. Chromosome pairing is crucial for homologous recombination and accurate chromosome segregation during meiosis.
Hanli You, Ding Tang, Huixin Liu, Yue Zhou, Yafei Li, Yi Shen, Zhiyun Gong, Hengxiu Yu, Minghong Gu, Jiming Jiang, Tao Zhang, Zhukuan Cheng   +11 more
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Chromosome Pairing in Autotetraploid Lolium

Biochemie und Physiologie der Pflanzen, 1973
Summary Cytological investigations have been made in the autotetraploids of two species ( Lolium temulentum and L. persicum ). Correlations between different meiotic metrics were computed. Comparisons between the tetraploids and their diploid parents were also made.
T.N. Mary, R.C. Tripathi, C.P. Malik
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CHROMOSOME PAIRING AND PHYLOGENETIC AFFINITIES

TAXON, 1972
SummaryThe mechanisms of chromosome pairing are poorly understood. Yet, pairing during meiotic prophase is commonly assumed to indicate homology, and absence of pairing non‐homology between parental genomes. These assumptions lead to the widely accepted belief that data on chromosome pairing in hybrids provide indisputable evidence of degree of ...
J. M. J. de Wet, J. R. Harlan
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CHROMOSOME PAIRING IN HEXAPLOID TRITICALE

Canadian Journal of Genetics and Cytology, 1971
A durum wheat background was shown to suppress the meiotic pairing of chromosomes of Secale montanum Guss. with homoeologues of S. cereale L. in hexaploid triticale. This effect was attributed to the activity of the 5BL diploidising system, apparently active in tetraploid wheat.
J. B. Thomas, P. J. Kaltsikes
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Joint Classification and Pairing of Human Chromosomes

IEEE/ACM Transactions on Computational Biology and Bioinformatics, 2005
We reexamine the problems of computer-aided classification and pairing of human chromosomes, and propose to jointly optimize the solutions of these two related problems. The combined problem is formulated into one of optimal three-dimensional assignment with an objective function of maximum likelihood. This formulation poses two technical challenges: 1)
Pravesh, Biyani, Xiaolin, Wu, Abhijit, Sinha   +2 more
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A cytophotometric study of chromosome pairing

Chromosoma, 1956
1. 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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Rapid homologue juxtaposition during meiotic chromosome pairing

Nature
AbstractA central basic feature of meiosis is pairing of homologous maternal and paternal chromosomes (“homologs”) intimately along their lengths. Recognition between homologs and their juxtaposition in space are mediated by axis-associated DNA recombination complexes.
Tadasu Nozaki, Beth Weiner, Nancy Kleckner   +2 more
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