Results 271 to 280 of about 57,771 (301)

Coordinating the events of the meiotic prophase

Trends in Cell Biology, 2005
Meiosis is a specialized type of cell division leading to the production of gametes. During meiotic prophase I, homologous chromosomes interact with each other and form bivalents (pairs of homologous chromosomes). Three major meiotic processes--chromosome pairing, synapsis and recombination--are involved in the formation of bivalents.
Wojciech P, Pawlowski, W Zacheus, Cande
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The nucleolus in telophase, interphase and prophase

Journal of Cell Science, 1980
ABSTRACT The ultrastructure of telophase to interphase has been followed in a green alga, Spirogyra submargaritata. A series of changes transitional between the late anaphase chromatid, the decondensing chromatid of telophase, and the ‘pale fibrillar material’ occupying channels in the nucleolus at interphase have been demonstrated ...
M, Ashraf, M B, Godward
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Chromosome Dynamics in Meiotic Prophase I in Plants

Cytogenetic and Genome Research, 2010
Early stages of meiotic prophase are characterized by complex and dramatic chromosome dynamics. Chromosome behavior during this period is associated with several critical meiotic processes that take place at the molecular level, such as recombination and homologous chromosome recognition and pairing.
Ronceret, Arnaud, Pawlowski, W.P.
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Chromatin organization during meiotic prophase ofBombyx mori

Chromosoma, 1980
Chromatin organization during the early stages of male meiotic prophase in Bombyx mori was investigated by electron microscopy. The analysis of nuclei prepared by the Miller spreading procedure, suggests that chromatin fibers which are 200-300 A in diameter undergo an orderly folding coincident with the formation of the synaptonemal complex.
J B, Rattner, M, Goldsmith, B A, Hamkalo
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Chromatin configuration during meiosis I prophase of spermatogenesis

Molecular Reproduction and Development, 1998
During the pachytene stage of meiotic prophase in male mammals, the X and Y chromosomes become transcriptionally inactive and establish a chromatin domain, the sex body, that is visually distinct from the transcriptionally active autosomes. We used objective criteria to assess these chromatin differences by DNase I sensitivity (DS) of sex chromosome ...
T, Wiltshire, C, Park, M A, Handel
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Asynchronous condensation of chromosomes from early prophase to late prophase as revealed by electron microscopic autoradiography

Experimental Cell Research, 1971
Abstract The morphological steps of chromosomal condensation during prophase were studied by means of light and electron microscopy and using electron microscopic autoradiography. By means of electron microscopic observation, the mid prophase chromosome was found to be composed chiefly of three sorts of chromatin with different degrees of ...
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Checkpoint mechanisms: the puppet masters of meiotic prophase

Trends in Cell Biology, 2011
The coordinated execution of cell cycle processes during meiosis is essential for the production of viable gametes and fertility. Coordination is particularly important during meiotic prophase, when nuclei undergo a dramatic reorganization that requires the precise choreography of chromosome movements, pairing interactions and DNA double-strand break ...
Amy J, MacQueen, Andreas, Hochwagen
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Prophase chromosome unique band sequences: definition and utilization

Cytogenetic and Genome Research, 1986
Extensive experience with the analysis of human prophase chromosomes and studies into the complexity of prophase banding patterns have suggested that at least some prophase chromosomal segments can be accurately identified and characterized independently of the morphology of the chromosome as a whole.
D H, Lockwood, V M, Riccardi, S O, Zimmerman, D A, Johnston   +3 more
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DNA Synthesis during Meiotic Prophase in Male Mice

Nature, 1968
DNA synthesis is thought to be confined to a specific segment of interphase (S) preceding cell division and to be completed prior to the onset of either mitosis or meiosis1. Chromosome pairing and crossing over between homologous chromosomes in meiosis are separate events, both of which involve the DNA moiety of the chromosomes. An explanation of these
Mukherjee, A B, Cohen, M M
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The Meiotic Prophase in Bombyx mori

1982
The first major step toward an understanding and a characterization of the ultrastructure of meiosis was performed about twenty-five years ago. In 1956, Moses reported in a combined light and electron microscopic study of crayfish spermatocytes, that homologous chromosomes at pachynema were held in register by a bipartite structure.
Søren Wilken Rasmussen, Preben Bach Holm   +1 more
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