Mitosis in Polyploid Somatic Cells ofLycopersicon EsculentumMill.
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چکیده
منابع مشابه
Sister Chromatid Segregation during Mitosis in Polyploid Wheat.
HE chromosomes of eukaryotes replicate in a semi-conservative manner (TAYLOR, WOODS and HUGHES 1957; PRESCOTT and BENDER 1963). Utilizing this observation, we have studied the segregation of sister chromatids during mitosis of plant and animal cells (LARK, CONSIGLI and MINOCHA 1966; LARK 1967). Autoradiographic measurements of segregation at the second mitosis following incorporation of radioac...
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At any point during the progression of many tumor types, cells can develop a hyperploid DNA content. Hyperploid tumors are significant more aggressive, with a higher growth rate and a poor patient prognosis. Yeast genetics have implicated three important genes involved in DNA ploidy changes: cdc2, cyclin b, and a specific inhibitor of the p34(cdc2)/cyclin B kinase, rum1. Mutations in these gene...
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Endopolyploidy arises during normal development in many species when cells undergo endocycles-variant cell cycles in which DNA replicates but daughter cells do not form. Normally, polyploid cells do not divide mitotically after initiating endocycles; hence, little is known about their mitotic competence. However, polyploid cells are found in many tumors, and the enhanced chromosomal instability...
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As a preliminary to an attempt to establish a computer model population which might be used to analyze modifications induced by physical or pharmacological agents (1), we have had to remeasure the mean durations of G2, S, and G I , and especially their variability for a HeLa strain (wild type) by running several Quastler-Sherman curves (2). Duplicate cultures maintained on coverslips in Leighto...
متن کاملChromosome pairing in polyploid cells.
The homologues in polyploid metaphases of air-dried suspensions of cultured cells are usually seen closely paired as diplochromosomes ("endore duplicated" cells) or unpaired as randomly distributed chromosomes ("poly ploid" cells). More often we find another configuration, a mixture of paired and unpaired chromosomes in the same metaphase, and describe here the conditions under which it appears...
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ژورنال
عنوان ژورنال: Caryologia
سال: 1956
ISSN: 0008-7114,2165-5391
DOI: 10.1080/00087114.1956.10797564