CHROMOSOME NUMBERS AND MEIOSIS IN CERTAIN SALICES
نویسندگان
چکیده
منابع مشابه
Chromosome Dynamics in Meiosis
Meiosis encompasses a large number of dynamic processes. Some of them are biochemical, such as formation and repair of meiotic double-strand breaks, while others are physical in nature, such as homologous chromosome segregation in anaphase I. Plants have been used as model species in meiosis studies for over 80 years. However, the past decade brought a dramatic improvement in the understanding ...
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Faithful chromosome segregation in meiosis is essential for ploidy stability over sexual life cycles. In plants, defective chromosome segregation caused by gene mutations or other factors leads to the formation of unbalanced or unreduced gametes creating aneuploid or polyploid progeny, respectively. Accurate segregation requires the coordinated execution of conserved processes occurring through...
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A MODEL FOR CHROMOSOME BEHAVIOR DURING MITOSIS AND MEIOSIS .................................... .. The Mitotic Cell Cycle .....................................................................•............................................ Interphase ........................................................................................................................................ . Metaphase ...
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During mitosis and meiosis sister chromatids are held together by protein complexes. This cohesion is important not only for pairwise alignment of chromosomes on the mitotic spindle but also for the generation of tension across centromeres – it counteracts the pulling force of spindle microtubules, which ensures the bipolar attachment of chromosomes. Chromosome cohesion thus enables accurate ch...
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The present study reports the chromosome number and meiotic behaviour of 14 populationsbelonging to four taxa of Anchusa subgenus Buglossum Gusul. from Iran. All populationsshowed the chromosome number 2n= 4x= 32. It is the first meiotic study for A. subg.Buglossum. We discuss some habit form and evolutionary aspect in the light of cytogeneticdata. The origin of polyploidy (auto-allopolyploidy)...
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ژورنال
عنوان ژورنال: Hereditas
سال: 2010
ISSN: 0018-0661
DOI: 10.1111/j.1601-5223.1955.tb03004.x