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.

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

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 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.

Meiosis is used for a special cell reproduction process of diploid organisms.

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

Meiosis ( cell reduction ) is the cellular process of gamete creation.

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

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

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.

* 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.

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

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

* After ovulation, oocytes remain in Meiosis I.

The oocyte proceeds to Meiosis II before fertilization.

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

This is puzzling to an outsider conscious of the classic tradition of liberalism, because it is clear that these Democrats who are left-of-center are at opposite poles from the liberal Jefferson, who held that the best government was the least government.

What was only a vague suspicion in the case of Sherlock Holmes now appears as a direct accusation: the private eye is in danger of turning into his opposite.

and according to them, whatever one fancies one feels, what one feels in fact is the opposite.

If Krutch is correct, tragedy may have quite the opposite effect.

Directly opposite is the emperor's door, through which they entered the building.

Taking the streetcar back to Kaiser's Fountain, I walked ahead, then left down the street opposite St. Sophia and just beyond the corner came to a small, one-story building with a red-tile roof, which is the entrance to the Sunken Palace.

If clay is slightly out of shape, square straight sides with guide sticks or rulers pressed against opposite sides, or smooth round pieces with damp fingers.

There are three principal feed bunk types for dairy and beef cattle: ( 1 ) Fence-line bunks -- cattle eat from one side while feed is put in from the opposite side of the fence by self-unloading wagons ; ;

Obviously, if colloidal particles bear charges of opposite sign or, if one kind is charged and the other kind is not, the attraction will be intensified and the tendency to agglomerate will be greatly reinforced.

Autosuggestibility, the reaction of the subject in such a way as to conform to his own expectations of the outcome ( i.e., that the arm-rise is a reaction to the pressure exerted in the voluntary contraction, because of his knowledge that `` to every reaction there is an equal and opposite reaction '' ) also seems inadequate as an explanation for the following reasons: ( 1 ) the subjects' apparently genuine experience of surprise when their arms rose, and ( 2 ) manifestations of the phenomenon despite anticipations of something else happening ( e.g., of becoming dizzy and maybe falling, an expectation spontaneously volunteered by one of the subjects ).

Similarly, at the opposite end of the market cycle, towards the end of an intermediate or major decline, usually while the bottom is being formed on the price chart, it is characteristic that an increase is noticed in odd-lot selling again alerting the chartist that a bottom is becoming a greater likelihood.

And the few must win what the many lose, for the opposite arrangement would not support markets as we know them at all, and is, in fact, unimaginable.

It also overlooks the fact that in a rational lexicon, and quite clearly in More's lexicon, the opposite of serious is not gay but frivolous, and the opposite of gay is not serious but solemn.

These will be numbered in the direction opposite to the flow of the process stream, so that stage R is the T stage from the end.

Instead of emotional recrimination, loaded phrases and sloganeering, we need a dispassionate study of the facts, a better understanding of the opposite viewpoint and a more serious effort to extend the areas of agreement until a solution is reached.

In a similar vein, but writing from the opposite side, Thomas Taylor, a private in the 6th Alabama Volunteers, in a letter to his wife, stated: `` you know that my heart is with you but I never could have been satisfied to have staid at home when my country is invaded by a thievin foe, by a set of cowardly skunks whose motto is Booty.