Meiosis involves two consecutive divisions, known as meiosis I and meiosis II, and is characterized by a unique set of events that ensure genetic diversity and maintain the chromosomal integrity of the species. During meiosis, a diploid cell, which contains two sets of chromosomes, undergoes a ...
Male meiosis is characterized by the presence of a prominent diffuse stage. Autosomal bivalents during late meiotic prophase and metaphase I consist of two parallelly aligned chromosomes; no traces of chiasmata could be found. The cytology of Nabis is further characterized by the lack of telo...
Meiosis I and Meiosis II. Each division is characterized by four sequential stages: prophase, metaphase, anaphase, and telophase. In Meiosis I (Figure 10.1.1), chromosomes exhibit specific behavior:1
The final phase of meiosis I is telophase 1, which is characterized by the migration of chromosomes to the spindle poles. A nuclear envelope could be formed around chromosomes before cytokinesis to produce two daughter cells of haploid sets of chromosomes. Most of the time, the chromosomes conden...
an organism will have 2n chromosomes in its diploid cells and 1n chromosomes in its haploid cells. Alternation of generations refers to a plant’s life cycle including sexual reproduction that is characterized by alternating between a diploid (2n) sporophyte phase and a haploid (1n) gametophyte ph...
The cryo-sections of previous stage oocytes at 0 h (A), 2 h (B), 4 h (C) and 6 h (D) after the hormone induction were stained by PI red fluorescence for the periphery nucleoli and DAPI blue fluorescence for meiotic chromosomes. The inducing time is shown on the left. Ful...
The cell cycle encompasses interphase cell division, characterized by the cell's preparatory step in order to go through the second step of the cell cycle. Body cells, called somatic cells, undergo the cell cycle and divide via mitosis. The process of mitosis is characterized by the division ...
Following DNA replication, the canonical sequence in species with monocentric chromosomes is characterized by reductional segregation of homologous chromosomes during the first and equational segregation of sister chromatids during the second meiotic division. Species with holocentric chromosomes employ specific...
In multicellular organisms, the entry into meiosis is a complex process characterized by increasing levels of meiotic specialization. We used single-cell RNA-sequencing to reconstruct the developmental program into meiosis in maize. We observed a smooth continuum of expression stages leading up to meios...
(interphaseInterphaseThe interval between two successive cell divisions during which the chromosomes are not individually distinguishable. It is composed of the g phases (g1 phase; g0 phase; g2 phase) and s phase (when DNA replication occurs).Cell Cycle), followed by 2 rounds of cellular ...