نتایج جستجو برای: meiotic behavior
تعداد نتایج: 630961 فیلتر نتایج به سال:
Background & Aim: Alhagi genus has two important medicinal plant species in Iran, including Alhagi pseudoalhagi, and A. graecorum (known “Kharshotor” in Persian). These plants are distributed in Iran like weeds. Generally, Alhagi is used as an anti-hemorrhoid, laxative and diuretic. Manna in both species produced by activity of a kind of insect on <...
Four populations of Pfaffia tuberosa, the Brazilian ginseng, collected in the central region of the state of Rio Grande do Sul (Brazil) were cytologically analyzed for meiotic behavior. All were tetraploid (2n = 4x = 68) and this condition could be observed through multiple chromosome pairing in pachytene and quadrivalent formation at diakinesis. Irregular chromosome segregation in both divisio...
chromosome number, meiotic behavior, and pollen viability were analyzed in 2 species of genus solenanthus, s. stamineus (desf.) wettst. and s. circinnatus ledeb, from iran. this report is the first cytogenetic analysis of these species. all taxa are diploid and possess 2n = 2x = 24 chromosome number, consistent with the proposed base number of x = 12. although this taxon displayed regular bival...
در این مطالعه، گزارش عدد کروموزومی میتوز برای 4 گونه متعلق به 4 بخش از جنس Oxytropis در ایران شامل O. bicornis از بخش Oxytropis (2n = 2x = 16)؛ O. suavis. از بخش Ortholoma (2n = 2x = (16،O. aucheri از بخش Eumorpha (2n = 2x = 16) وO. karjaginii از بخش Janthina (2n = (4x = 32 ارائه شده است. این گزارش اولین مطالعه سیتوژنتیکی بر روی این تاکسونها میباشد. تمام گونه های مورد مطالعه (به استثناء O. ...
habit and pollen morphology were studied in four taxa belonging to astragalus sect. macrophyllium in iran. data obtained from pollen morphology support the phenetic grouping based on habit morphology. in addition, meiotic chromosome number and behavior were analyzed in two species of the section. the species were cytogenetically analyzed and found to be tetraploid and possess a 2n = 4x = 32 chr...
The behavior of meiotic chromosomes differs in several respects from that of their mitotic counterparts, resulting in the generation of genetically distinct haploid cells. This has been attributed in part to a meiosis-specific chromatin-associated protein structure, the synaptonemal complex. This complex consist of two parallel axial elements, each one associated with a pair of sister chromatid...
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