Meiosis is similar to mitosis in many ways, but there are a couple of important differences. First of all, even though meiosis starts with a diploid cell (a primary oocyte or primary spermatocyte), its end products are 4 haploid daughter cells, each with 23 chromosomes. Instead of being c...
At the (3′) end, you'll turn to meiosis 来自 国家科技图书文献中心 喜欢 0 阅读量: 22 作者:A Moldón,J Ayté 摘要: Many cellular fates are determined by different genetic programs, but the regulation of cellular differentiation is still not well understood. Besides the possible control ...
At the end of meiosis tetrads of diploid pollen grains are formed. Failure of wall formation.—In other cases the spindle at pre-meiotic mitosis fails only in regard to wall formation. This is evident from cells which enter meiosis with two diploid nuclei in each (plate, fig. 3). Such ...
Fertility is known to be impaired more frequently in patients with chronic kidney disease than in the general population. A significant proportion of chronic kidney disease patients may therefore need Medically Assisted Reproduction. The paucity of information about medically assisted reproduction for chroni...
The green signal in the middle of X+4 has switched its location to the distal end of 1p+4 as a result of the inversion (Figure 1b). Because no inversion loop has been detected during meiosis of male black muntjacs [24], the whole 1p+4 should remain heterosynaptic except for the two...
During meiotic prophase I, telomeres attach to and move on the nuclear envelope (NE), regulating chromosome movement to promote homologous pairing. Meiosis-specific proteins TERB1, TERB2 and MAJIN play a key role in this process. Here, we report the crys
Within this specialized closed structure, the cleistothecium, cytoplasmic and nuclear fusion occur followed by successive rounds of meiosis and mitosis generating sac-like asci containing 8 ascospores, the end-product of sexual replication. Generation of congenic strains in H. capsulatum is challenging...
In mammalian meiotic prophase, homologous chromosome recognition is aided by formation and repair of programmed DNA double-strand breaks (DSBs). Subsequently, stable associations form through homologous chromosome synapsis. In male mouse meiosis, the lar
An abnormal chromosome produced during mitosis or meiosis that is characterized by the presence of two genetically and morphologically identical chromosome arms fused at the centromere. Strictly, the common alteration of chromosome 17 in medulloblastoma is more often an isodicentric (17q), as the brea...
Ongoing studies in many species seek to understand the origins, architecture and consequences of phenotypic variation under normal and dysfunctional conditions, with the aim of identifying targets for intervention that can prevent, stabilize or reverse d