Speed RM, Chandley AC (1990) Prophase of meiosis in human spermatocytes analysed by EM microspreading in infertile men and their controls and comparisons with human oo- cytes. Hum Genet 84:547-554Speed, R.M. and Chandley, A.C. (1990) Prophase of meiosis in human spermatocytes analysed ...
1.The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell. 2.The first stage of meiosis, constituted by a series of events that include the thickening and coiling of ...
Entry into meiosis can be defined both through a drastic change in gene expression and through initiation of the nuclear events of the MPI. MPI is relatively long and is typically divided into four successive stages: leptotene, zygotene, pachytene and diplotene, which are preceded by the prele...
1. the first stage of meiosis 2. the first stage of mitosis 行业词典 人体组织学 [分裂]前期 医学 前期:细胞复制的第一期。有丝分裂时,在此阶段由于DNA极度盘绕,染色体变得可见,细胞核开始失去原来的样子,中心粒开始移动。减数分裂时第一次分裂的前期包括五个阶段:细线期、偶线期、粗线期、双线期和丝球...
Prophase I is the defining stage of meiosis in that it is unique from mitotic prophase and in that it encompasses many of the I unique features of meiosis, including formation of the synaptonemal complex (SC), pairing of homologous (maternal and paternal) chromosomes, and formation of chiasma...
What's the difference between mitosis and meiosis?Learn more with our side-by-side comparison. Need to review the different parts of the cell and what they do?We walk you through thefunctions of the cell membrane,endoplasmic reticulum, andvacuoles. If you learn better by looking at the big...
meiosis, corresponding to the zygotene phase of prophase I (Fig. 2B), whereas chromosomes of the mutant were aberrantly condensed into crescent-like structure (Fig. 2G). In the later stages, in the wild-type, dyads were generated, indicating meiosis I had been completed (Fig. 2C), which...
Liu D, Liao C, Wolgemuth DJ (2000) A role for cyclin A1 in the activation of MPF and G2-M transition during meiosis of male germ cells in mice. Dev Biol 224:388–400 Marcon E, Moens P (2003) MLH1p and MLH3p localize to precociously induced chiasmata of okadaic-acid-treated mouse...
Pollen mother cells (PMCs) remain mitotic in most am1 mutants including am1-489, while am1-praI permits meiotic entry but PMCs arrest at the leptotene/zygotene (L/Z) transition, defining the roles of AM1 protein in two distinct steps of meiosis. To gain more insights into the roles of...
Pairing of homologous chromosomes in meiosis is critical for their segregation to daughter cells. In most eukaryotes, clustering of telomeres precedes and facilitates chromosome pairing. In several species, centromeres also form pairwise associations, known as coupling, before the onset of pairing. We...