Results 271 to 280 of about 2,725,833 (311)

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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Genetic Variation in Chromosome Pairing

, 1965
Publisher Summary This chapter discusses the genetic variation in chromosome pairing. Alterations in the behavior of chromosomes at meiosis are known to result from genetic variation as well as from differences in several environmental factors. The operation of selection on genetically controlled variation in the chromosomal phenotype is responsible ...
R. Riley, C. N. Law
semanticscholar   +2 more sources

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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Homologous chromosome pairing in Schizosaccharomyces pombe

Yeast, 2006
AbstractHomologous chromosome pairing is a central feature of meiosis I, contributing to the correct segregation of chromosomes during meiosis. The fission yeast, Schizosaccharomyces pombe, has been widely used to study meiotic chromosome dynamics, partly because studies in this yeast are simplified due to the lack of post‐pairing synaptic structures ...
Jennifer L, Wells, David W, Pryce, Ramsay J, McFarlane   +2 more
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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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