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

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

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.

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

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

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

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

* 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.

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

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

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

* How Cells Divide: Mitosis vs. Meiosis

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

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

Meiosis takes place at the time of germination.

* 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.

Meiosis occurs during germination of the zygosporagium so the resulting spores or hyphae are haploid.

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