منابع مشابه
Condensin in Chromatid Cohesion and Segregation.
After replication of genomic DNA during the S phase, 2 chromatids hold together longitudinally. When cells enter mitosis, the paired sister chromatids start to condense and then segregate into individual chromatids except for the centromeric region. Upon attachment of microtubules to the kinetochore, subsequent pulling of the 2 sister chromatids by the spindles towards opposite poles results in...
متن کاملChromatid segregation of tetraploids and hexaploids.
N an earlier paper (GEIRINGER 1948) the author has investigated the matheI matical genetics of autopolyploids if one locus is considered and chromosome segregation is assumed. A paper on the linkage theory of autopolyploids (m loci), under the same assumption, is in press (GEIRINGER 1949). However, while chromosome segregation might be assumed as an approximation theory, the study of polyploids...
متن کاملSegregation in New Allopolyploids of Gossypium. II. Tetraploid Combinations.
N two other papers in this series (GERSTEL 1956; GERSTEL and PHILLIPS in prep.) I the segregation of artificial hexaploid combinations was described. These had been obtained by crossing tetraploid New World cottons with diploid Wild American species and subsequent doubling of the chromosome number. For certain characters these hexaploids were of duplex genotype (i.e. of the type ZZzz). Segregat...
متن کاملAlternative meiotic chromatid segregation in the holocentric plant Luzula elegans
Holocentric chromosomes occur in a number of independent eukaryotic lineages. They form holokinetic kinetochores along the entire poleward chromatid surfaces, and owing to this alternative chromosome structure, species with holocentric chromosomes cannot use the two-step loss of cohesion during meiosis typical for monocentric chromosomes. Here we show that the plant Luzula elegans maintains a h...
متن کاملNonselective sister chromatid segregation in mouse embryonic neocortical precursor cells.
We have investigated whether the precursor cells that give rise to the neurons of the neocortex during mouse embryonic development segregate sister chromatids nonrandomly upon mitosis, as would be predicted by the immortal strand hypothesis. Using various protocols of 5-bromo-2-deoxyuridine (BrdU) labeling and chase, we were unable to detect BrdU label-retaining neocortical precursor cells at a...
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ژورنال
عنوان ژورنال: Nature
سال: 1932
ISSN: 0028-0836,1476-4687
DOI: 10.1038/129869a0