The typical behavior of chromosomes in meiosis is that homologous pairs synapse, recombine, and then separate at anaphase I. At anaphase II, sister chromatids separate. However, studies of small chromosomes in maize derived from a variety of sources typically have failure of sister chromatid cohesion at anaphase I. This failure occurs whether there is pairing of two copies of a minichromosome o...

BACKGROUND Complex chromosomal rearrangements (CCRs) describe structural rearrangements, essentially translocations, involving at least three breakpoints on two or more chromosomes. Although they are rare in humans, their clinical identification is important since CCR carriers can display various phenotypes which include phenotypically normal subjects, infertile males and patients with mental r...

In order to simulate the process of homology searching and interlocking of chromosomes in meiotic pairing, a cellular automaton model is introduced. The model reflects both the spatial as well as the temporal behavior of chromosomes in the meiotic cell nucleus. Moreover, we compare the outcome of our simulations to results obtained by a stochastic model describing interlocking probabilities ana...

The present study reports the chromosome number and meiotic behavior including microsporogenesis of Actaea kashmiriana J. Compton its relation with pollen fertility seed set. species showed a count 2n=4x=32 chromosomal irregularities such as chromatin stickiness, cytomixis, laggard formation, bridges, micronuclei polysporads. B-chromosomes were also observed in this species. Due to these irregu...

Centromere behavior is specialized in meiosis I, so that sister chromatids of homologous chromosomes are pulled toward the same side of the spindle (through kinetochore mono-orientation) and chromosome number is reduced. Factors required for mono-orientation have been identified in yeast. However, comparatively little is known about how meiotic centromere behavior is specialized in animals and ...

Errors during the first meiotic division are common in our species, but virtually all occur during female meiosis. The reason why oogenesis is more error prone than spermatogenesis remains unknown. Normal segregation of homologous chromosomes at the first meiotic division (MI) requires coordinated behavior of the sister chromatids of each homolog. Failure of sister kinetochores to act cooperati...

Material and methods. ................................. A brief resume of meiotic behavior in diploid individuals. Meiosis in the triploid individual. ....................... Plaamodial sporogenous tissue. .......................... Chromatin extrusion in sporogenous tissue ................ TheF~generation ..................................... Meiosis in Fr individuals. ...........................