Andrey V. Rodionov

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The lampbrush chromosomes (LBC) were prepared from growing oocytes 0.75-1.50 mm in diameter. A map of 6 autosomes and the ZW sex bivalents is presented. Several types of landmarks were noticed: lumpy loops (LL), telomeric bow-like loops (TBL), some large loops in interstitial regions (marker loops--ML). Supposedly, the centromeres of LBC in the chicken are(More)
Cytological map of lampbrush macrobivalents of the Japanese quail (Coturnix coturnix japonica) were constructed. Investigation of chiasmata allowed to estimate the frequency of reciprocal genetic recombination (crossing over) in Japanese quail female meiosis. The total chiasma number in bivalents of Japanese quail oocyte nuclei was determined to be 53–58.(More)
Chromosome structure and chromatin organisation of a two-chromosome model cereal Zingeria biebersteiniana (Claus) P. Smirnov were studied: nuclear DNA content was determined by microdensitometric analysis after Feulgen staining; Feulgen absorption at different thresholds of absorbance in interphase nuclei also provided evidence on the organisation of(More)
The karyotype of the chicken Gallus gallus domesticus was studied by means of pulsed-field electrophoresis. An electrokaryogram was obtained for the microchromosomal (MI) portion of the chicken genome. Chicken MIs were separated into two fractions. A fraction with a higher mobility included MIs sized 3.4-4.8 Mb; the lower size limit of a less mobile(More)
Chromosome C-banding and two-color fluorescent in situ hybridization (FISH) were used to compare the chromosomes, to identify the chromosomal localization of the 45S and 5S rRNA genes, and to analyze the sequences of internal transcribed spacers 1 and 2 (ITS1 and ITS2) of the 45S rRNA genes in the genomes of grasses Zingeria biebersteiniana (2n = 4), Z.(More)
Andrey V. Rodionov,1 Andrzej Veitia,1 R. Barends,2 J. Kelly,2 Daniel Sank,2 J. Wenner,2 John M. Martinis,2 Robert L. Kosut,3 and Alexander N. Korotkov1 1Department of Electrical Engineering, University of California, Riverside, California 92521, USA 2Department of Physics, University of California, Santa Barbara, California 93106, USA 3SC Solutions, 1261(More)
Karyotypes of lower vertebrates mainly consist of microchromosomes. In higher vertebrates, microchromosomes are present in each class of the most primitive orders. Birds have more microchromosomes in their karyotype than other vertebrates. Accumulation of microchromosomes in the avian karyotype probably occurred after separation of birds from reptilians in(More)
The karyotype of the chicken Gallus gallus domesticuswas studied by means of pulsed-field electrophoresis. An electrokaryogram was obtained for the microchromosomal (MI) portion of the chicken genome. Chicken MIs were separated into two fractions. A fraction with a higher mobility included MIs sized 3.4–4.8 Mb; the lower size limit of a less mobile fraction(More)
Chiasmata in diplotene bivalents are located at the points of physical exchange (crossing-over) between homologous chromosomes. We have studied chiasma distribution within chicken lampbrush chromosome 1 to estimate the crossing-over frequency between chromosome landmarks. The position of the centromere and chromosome region 1q3.3-1q3.6 on lampbrush(More)