نتایج جستجو برای: chiasma frequency
تعداد نتایج: 484563 فیلتر نتایج به سال:
An ultradense genetic linkage map with >10,000 AFLP loci was constructed from a heterozygous diploid potato population. To our knowledge, this is the densest meiotic recombination map ever constructed. A fast marker-ordering algorithm was used, based on the minimization of the total number of recombination events within a given marker order in combination with genotyping error-detection softwar...
Replication protein A (RPA) is a conserved heterotrimeric protein complex comprising RPA1, RPA2, and RPA3 subunits involved in multiple DNA metabolism pathways attributable to its single-stranded DNA binding property. Unlike other species possessing a single RPA2 gene, rice (Oryza sativa) possesses three RPA2 paralogs, but their functions remain unclear. In this study, we identified RPA2c, a ri...
Provided that there is no chromatid interference, no movement of chiasmata, and no discrepancies between meiotic and mitotic chromosome lengths, then genetic maps and recombination fractions may be directly derived from our meiotic chiasma distribution data. This is illustrated by male chiasma derived genetic lengths and recombination fractions along chromosome 13. The recombination fraction be...
HEI10 was first described in human as a RING domain-containing protein that regulates cell cycle and cell invasion. Mice HEI10(mei4) mutant displays no obvious defect other than meiotic failure from an absence of chiasmata. In this study, we characterize rice HEI10 by map-based cloning and explore its function during meiotic recombination. In the rice hei10 mutant, chiasma frequency is markedly...
Tumours arising in the small area at the base of the brain between the optic chiasma and cerebral peduncles are common and include meningiomas, suprasellar and pituitary neoplasms, aneurysm of the circle of Willis, and chiasmal arachnoiditis with cyst formation. Tumours arising in the optic chiasma and nerve sheaths, however, are very uncommon. In all these conditions, visual symptoms may obtru...
T h e use of telomeric C-bands in wheat-rye hybrids has made it possible to distinguish three types of wheat-wheat ( IBL) and wheat-rye associations (a, endto-end extremely distal; b , end-to-ed distal; and c, interstitial) between homoeologous chromosomes at different metaphase I stages (early, middle and late) and also to estimate the actual recombination frequencies for such associations at ...
WHEREAS from the myelo-architectonic point of view the chiasma is merely an organ of transit, this is not so from the vascular point of view; there seems to be a partial dissociation between the myelo-architecture and the angio-architecture. The vascularization of the chiasma has been investigated on the basis of 22 human specimens. The techniques used (dissection after fixation in 10 per cent....
Thymidine-H(3) of high specific activity was used to study the distribution of labeled chromatids during meiotic divisions in spermatocytes of a species of grasshopper (Orthoptera). The distribution is regularly semiconservative as has been shown previously for mitosis, i.e., all chromatids are labeled after incorporation of thymidine-H(3) into DNA at premeiotic interphase. If incorporation occ...
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