Meiosis occurs in eukaryotic life cycles involving sexual reproduction, consisting of the constant cyclical process of meiosis and fertilization.

* Ixeris type: Meiosis I fails to complete ; three rounds of nuclear division occur without cell-wall formation ; wall formation then occurs.

Meiosis generates genetic diversity in two ways: ( 1 ) independent alignment and subsequent separation of homologous chromosome pairs during the first meiotic division allows a random and independent selection of each chromosome segregates into each gamete ; and ( 2 ) physical exchange of homologous chromosomal regions by homologous recombination during prophase I results in new combinations of DNA within chromosomes.

Meiosis during spermatogenesis is specific to a type of cell called spermatocytes that will later mature to become spermatozoa.

Meiosis takes place at the time of germination.

Meiosis I separates homologous chromosomes, producing two haploid cells ( N chromosomes, 23 in humans ), so meiosis I is referred to as a reductional division.

Meiosis I and II are each divided into prophase, metaphase, anaphase, and telophase stages, similar in purpose to their analogous subphases in the mitotic cell cycle.

Meiosis is divided into meiosis I and meiosis II which are further divided into Karyokinesis I and Cytokinesis I & Karyokinesis II and Cytokinesis II respectively.

Meiosis begins with one diploid cell containing two copies of each chromosome — one from the organism's mother and one from its father — and produces four haploid cells containing one copy of each chromosome.

Meiosis II consists of decoupling each chromosome's sister strands ( chromatids ), and segregating the individual chromatids into haploid daughter cells.

Meiosis follows shortly with the production of 4 haploid nuclei that migrate into 4 external, usually apical basidiospores.

This is the haploid amount of DNA, often symbolized as N. Meiosis is used by diploid organisms to produce haploid gametes.

Meiosis () is a special type of cell division necessary for sexual reproduction in eukaryotes.

Meiosis is a key feature for all sexually reproducing eukaryotes in which homologous chromosome pairing, synapse and recombination occur.

Meiosis uses many of the same mechanisms as mitosis, a type of cell division used by eukaryotes like plants and animals to split one cell into two identical daughter cells.

Meiosis does not occur in archaea or bacteria, which generally reproduce via asexual processes such as binary fission.

Meiosis was discovered and described for the first time in sea urchin eggs in 1876 by the German biologist Oscar Hertwig.

* Growth 2 ( G < sub > 2 </ sub >) phase: G < sub > 2 </ sub > phase as seen before mitosis is not present in Meiosis.

Meiosis I consists of separating the pairs of homologous chromosome, each made up of two sister chromatids, into two cells.

* How Cells Divide: Mitosis vs. Meiosis

Meiosis results in a random segregation of the genes contributed from each parent.

* Taraxacum type: Meiosis I fails to complete, meiosis II creates two cells, one of which degenerates ; three mitotic divisions form the megagametophyte.

* After ovulation, oocytes remain in Meiosis I.

The oocyte proceeds to Meiosis II before fertilization.

Meiosis is the opposite of auxesis, and also sometimes used as a synonym for litotes.

* 1793 – The insurrection of Lyon occurs during the French Revolution.

The spread of antibacterial resistance often occurs through vertical transmission of mutations during growth and by genetic recombination of DNA by horizontal genetic exchange.

Rainfall occurs mostly during the spring and autumn.

The formation of bone during the fetal stage of development occurs by two processes: Intramembranous ossification and endochondral ossification.

Intramembranous ossification mainly occurs during formation of the flat bones of the skull but also the mandible, maxilla, and clavicles ; the bone is formed from connective tissue such as mesenchyme tissue rather than from cartilage.

Language learning normally occurs most intensively during human childhood.

The virus is a teratogenic pathogen which causes abortions, stillbirths, premature births and congenital abnormalities, but occurs only during some years.

With innate talent, passion, diligence, discipline, self-motivation and tenacity, being the core factors of achieving success to becoming a celebrity, fame and fortune sometimes occurs spontaneously with relatively little effort due to sheer luck, being fortunate with connections, or simply being at the right place during the right time.

Most summer rainfall occurs during thunderstorms and from occasional tropical cyclones.

The subsequent excavation of the crater occurs more slowly, and during this stage the flow of material is largely sub-sonic.

In tropical regions, such as their native habitats, breeding occurs throughout the year, but in subtropical areas, breeding occurs only during warmer periods that coincide with the onset of the wet season.

Female coyotes are monoestrous, and remain in estrus for two to five days between late January and late March, during which mating occurs.

::" An official perfect game occurs when a pitcher ( or pitchers ) retires each batter on the opposing team during the entire course of a game, which consists of at least nine innings.

The clinical manifestations of Chagas disease are due to cell death in the target tissues that occurs during the infective cycle, by sequentially inducing an inflammatory response, cellular lesions, and fibrosis.

This commonly occurs during deliberate knuckle-cracking.

Transpiration, during which carbon dioxide enters the plant and water escapes, does not take place during the day at the same time as photosynthesis, but instead occurs at night.

When the plasma goes upward from the footpoints towards the loop top, as it always occurs during the initial phase of a compact flare, it is defined as chromospheric evaporation.

Another biologically important process that occurs during development is apoptosis — programmed cell death or " suicide.

Though by no means a certainty, déjà vu occurs often enough during seizures that researches have reason to suspect a link.

In most contemporary educational systems of the world, secondary education comprises the formal education that occurs during adolescence.

Secondary education occurs mainly during the teenage years.

Almost all the annual rainfall and the highest humidity occurs during this time, and yearly rain totals, particularly on southern-facing mountain slopes, can be as high as.

NBTE usually occurs during a hypercoagulable state such as system wide bacterial infection, or pregnancy, though it is also sometimes seen in patients with venous catheters.