Now showing items 1-10 of 15
The pairing of X and Y chromosomes during meiotic prophase in the marsupial species Thylamys elegans is maintained by a dense plate developed from their axial elements
Unlike eutherian males, pairing of the sex chromosomes in marsupial males during the first meiotic prophase is not mediated by a synaptonemal complex. Instead, a specific structure, the dense plate, develops during pachytene ...
Number and nuclear localisation of nucleoli in mammalian spermatocytes
In seven mammalian species, including man, the position and number of nucleoli in pachytene spermatocyte nuclei were studied from electron microscope (EM) nuclear sections or bivalent microspreads. The number and position ...
Differential localization of α' and β subunits of protein kinase CK2 during rat spermatogenesis
Protein kinase CK2 is a serine/threonine kinase expressed in organisms from yeast to human and is composed of a catalytic subunit (α or α') and a regulatory subunit (β) forming a holoenzyme with the possible subunit ...
The robertsonian phenomenon in the house mouse: mutation, meiosis and speciation
(Springer Science and Business Media Deutschland GmbH, 2014)
© 2014, Springer-Verlag Berlin Heidelberg. Many different chromosomal races with reduced chromosome number due to the presence of Robertsonian fusion metacentrics have been described in western Europe and northern Africa, ...
Meiotic behavior of a complex hexavalent in heterozygous mice for Robertsonian translocations: insights for synapsis dynamics
(Springer Science and Business Media Deutschland GmbH, 2019)
Natural populations of the house mouse Mus musculus domesticus show great diversity in chromosomal number due to the presence of chromosomal rearrangements, mainly Robertsonian translocations. Breeding between two populations ...
Inactivation or non-reactivation: What accounts better for the silence of sex chromosomes during mammalian male meiosis?
During the first meiotic prophase in male mammals, sex chromosomes undergo a program of transcriptional silencing called meiotic sex chromosome inactivation (MSCI). MSCI is triggered by accumulation of proteins like BRCA1, ...
Efecto del choque térmico sobre la eficiencia en la triploidización y la sobrevivencia de larvas de Rhamdia quelenEffect of thermalshock on triploidization efficiency and survival of larvae of Rhamdia quelen
(Bogotá : Universidad de Ciencias Aplicadas y Ambientales, 2012, 2019)
A high incidence of meiotic silencing of unsynapsed chromatin is not associated with substantial pachytene loss in heterozygous male mice carrying multiple simple Robertsonian translocations
Meiosis is a complex type of cell division that involves homologous chromosome pairing, synapsis, recombination, and segregation. When any of these processes is altered, cellular checkpoints arrest meiosis progression and ...
Subcellular structure of prenatal human ovary: Mitochondrial distribution during meiotic prophase
The dynamics of mitochondrial population during the first meiotic prophase in the fetal human ovary was studied in sequential stages of development, from week 13 to week 23 of intrauterine life; the study was performed by ...
Hexavalents in spermatocytes of Robertsonian heterozygotes between Mus m. domesticus 2n=26 from the Vulcano and Lipari Islands (Aeolian archipelago, Italy)
(Luigi Ponzio e figlio Editori, 2018)
© S. Berríos et al. The size and shape of the chromosomes, as well as the chromosomal domains that compose them, are determinants in the distribution and interaction between the bivalents within the nucleus of spermatocytes ...