Ümit Kumbıçak, Zübeyde Kumbıçak* and Gülnare Huseynli
... karyogram and course of meiosis of Hersiliola bayrami were determined based on Giemsa-stained testicular chromosomes for the first time. Results of spermatogonial metaphases showed that the chromosome number and the karyotype formula of the species was 2n♂=35 (X1X2X30) which is the first record for the family Hersiliidae. Both autosomes and sex chromosomes were acrocentric. The lengths of the chromosomes indicated...
Zübeyde Kumbıçak1,* and Hatice Poyraz2
...dually in size. All male meiosis was chiasmate and during the first meiotic division stages, 10 autosomal bivalents and generally one chiasma per bivalent (rarely two chiasmata) were obtained, the types of chiasmata were proximal, interstitial and terminal. In second meiotic division, two types of nuclei were showed as n=12 and n=10 chromosomes. Considering our results and previously obtained data in other ground spider species, the conventional staining provi...
Lei Gao1, Gong-xue Jia2, Zheng-yuan Huang1, Ming-xing Yue3, Chao Zhang1, Shi-en Zhu1 and Xiang-wei Fu1,*
...d the effect of aging on meiosis progression, embryo developmental competence and DNA double-strand breaks (DSBs) in mouse oocytes and resultant early embryos. Germinal vesicle (GV) oocytes were first cultured to monitor the progression of germinal vesicle breakdown (GVBD) and polar body extrusion (PBE) during in vitro maturation (IVM), then the harvested metaphase II (MII) oocytes were parthenogenetically activated to evaluate pronuclear (PN) formation...
