Meiosis is a hotspot for gene expression and sperm development, which involves copying long stretches of DNA into RNA.
Most of the cases reported have been associated with a malsegregation 3:1 in
meiosis I, during gametogenesis, in the balanced-translocation carrier.
Based on our findings, the lack of proteins similar to the SC proteins of the model organisms in Rhodophyta, Euglenophyta, Chrysophyta, Charophyta, Xanthophyta, and Dinoflagellata makes it possible to assume that
meiosis in these algae differs from classical
meiosis in proceeding without any SC or that unknown new proteins form SCs in these algae.
Se presentan estudios detallados de ultraestructura de los principales sucesos ocurridos durante la
meiosis, maduracion de las esporas, morfologia de la pared esporal y de los elateres, y se analiza el origen, caracteristicas y naturaleza de las orbiculas presentes en los elateres y el perisporio.
Comparative studies of sporogenesis including the mechanisms of
meiosis, cytokinesis, and spore wall elaboration provide valuable information leading to a better understanding of evolutionary relationships among major groups of primitive land plants (Blackmore & Knox, 1990).
Meiosis General Overview: What Makes
Meiosis Different from Mitosis?
The spindles, which come from the two poles of a cell when a cell enters mitosis or
meiosis, are similar to two springs, each of which has its own polar-ejection forces because it gains energy during interphase.
In fact, pairing in
meiosis constitutes the main problem in inversion heterozygosis.
Por lo tanto conocer las caracteristicas del cromosoma profasico durante la primera
meiosis es importante para deducir la presencia y formacion de gametos viables en la especie.
The egg must reduce its genetic material by half; the basic choreography of the ensuing chromosomal dance, known as
meiosis, is well understood.
To produce fertile offspring, the mule's chromosomes first need to pair off evenly during
meiosis. This process of cell division produces an organism's reproductive cells (eggs for females and sperm for males).
On this species he later developed his PhD thesis and published his first scientific work on female
meiosis. We agree that Michael White's enduring influence has moulded to a great extent, our thinking on cytogenetic and evolutionary matters.
The B chromosomes show instability during
meiosis, but present preferential segregation for the nuclei which form gametes, and normal behaviour during the mitotic process, except in the second division of the microspores in the endosperm and tapetal cell, where they show high nondisjunction rates (RANDOLPH, 1941; RHOADES et al., 1967; CARLSON, 1986; GONZALEZ-SANCHEZ et al., 2004).
Analysis of
meiosis was made in tassels, and seedlings were obtained whose chromosomal number was determined in root tips and by DNA quantification using flow cytometry.
Comparison of the male and female karyotypes, as well as analysis of male
meiosis, revealed an X0 sex chromosome system.
