Results 271 to 280 of about 2,401,068 (320)
Some of the next articles are maybe not open access.
Centromere Associations in Meiotic Chromosome Pairing.
Annual Review of Genetics, 2015Production of gametes of halved ploidy for sexual reproduction requires a specialized cell division called meiosis. The fusion of two gametes restores the original ploidy in the new generation, and meiosis thus stabilizes ploidy across generations.
Olivier Da Ines, C. White
semanticscholar +3 more sources
Sex-chromosome pairing and male fertility.
Cytogenetic and Genome Research, 1974In this paper a hypothesis is presented which relates chromosome pairing and sterility in males. This hypothesis has been formulated on the basis of data from numerous meiotic systems in the male of <i>Drosophila melanogaster, </i>where the sex chromosomes have heterochromatic pairing sites, sites which must interact in order for ...
G. Miklos
semanticscholar +3 more sources
Meiotic Chromosome Pairing in Triticale
Nature, 1970CONSIDERABLE attention is currently being paid to the possible use of Triticale as a new crop; indeed, a variety has already been named in Canada1. Triticale is a hybrid genus of synthetic amphiploids which have the full chromosome complements of wheat (Triticum) and rye (Secale). Octoploid forms, of Triticale have fifty-six chromosomes, made up of the
R, Riley, T E, Miller
openaire +2 more sources
Homologous chromosome pairing in wheat
Journal of Cell Science, 1999ABSTRACT Bread wheat is a hexaploid (AABBDD, 2n=6x=42) containing three related ancestral genomes, each having 7 chromosomes, giving 42 chromosomes in diploid cells. During meiosis true homologues are correctly associated in wild-type wheat, but a degree of association of related chromosomes (homoeologues) occurs in a mutant (ph1b).
E, Martínez-Pérez +5 more
openaire +2 more sources
Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1977
Commonly accepted precepts are challenged : (1) that homologous chromosome pairing is normally mediated by nuclear envelope attachment sites; (2) that crossover site establishment awaits synaptic completion; and (3) that it is the function of the synaptonemal complex to hold homologues in register so that equal crossing over can occur, and perhaps to ...
openaire +2 more sources
Commonly accepted precepts are challenged : (1) that homologous chromosome pairing is normally mediated by nuclear envelope attachment sites; (2) that crossover site establishment awaits synaptic completion; and (3) that it is the function of the synaptonemal complex to hold homologues in register so that equal crossing over can occur, and perhaps to ...
openaire +2 more sources
Centromere pairing precedes meiotic chromosome pairing in plants
Science China Life Sciences, 2017Meiosis is a specialized eukaryotic cell division, in which diploid cells undergo a single round of DNA replication and two rounds of nuclear division to produce haploid gametes. In most eukaryotes, the core events of meiotic prophase I are chromosomal pairing, synapsis and recombination.
Jing, Zhang, Fangpu, Han
openaire +2 more sources
Mechanism of Chromosome Pairing during Meiosis
Nature, 1970Electron microscopy with whole mount preparations has revealed that the synaptonemal complex merely pulls two homologous chromosomes together. Intimate molecular pairing is another matter—probably brought about by connexions between short stretches of single stranded DNA.
D E, Comings, T A, Okada
openaire +2 more sources
Automatic chromosome pairing using mutual information
2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2008Cytogenetics is a key tool in the detection of acquired chromosomal abnormalities and in the diagnosis of genetic diseases such as leukemia. The karyotyping is a set of procedures, in the scope of the cytogenetics, that produces a visual representation of the 46 chromosomes (called karyogram), paired and arranged in decreasing order of size.
Artem, Khmelinskii +2 more
openaire +2 more sources
Pairing at the chromosomal level
Journal of Cellular Physiology, 1967The discovery of the phenomenon of nonhomologous pairing in the female of Drosophila melanogaster provided a genetic tool for analyzing chromosome behavior, which has made it possible to establish a temporal order of meiotic events that includes two types of pairing, one preceding exchange (exchange pairing) and one following exchange (distributive ...
openaire +2 more sources
Triple Chromosome Pairing in Triploid Chickens
Nature, 1971THE statement that “only two homologous chromosomes can pair at one time” is one of the most basic of cytogenetic principles. It is founded on observations of meiosis in triploid and tetraploid organisms1–7 which have suggested that if three homologues are present, they will occur as a pair and a single unpaired chromosome.
D E, Comings, T A, Okada
openaire +2 more sources