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

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

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.

* 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.

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 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 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.

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.

* 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.

In germline cells the imprint is erased and then re-established according to the sex of the individual ; i. e. in the developing sperm ( during spermatogenesis ), a paternal imprint is established, whereas in developing oocytes ( oogenesis ), a maternal imprint is established.

In males, meiosis occurs during spermatogenesis in the seminiferous tubules of the testicles.

Studies have demonstrated that new gene mutations for achondroplasia are exclusively inherited from the father and occur during spermatogenesis ; it is theorized that oogenesis has some regulatory mechanism that hinders the mutation from originally occurring in females ( although females are still readily able to inherit and pass on the mutant allele ).

The developing male germ cells do not complete cytokinesis during spermatogenesis.

Sertoli cells also act as phagocytes, consuming the residual cytoplasm during spermatogenesis.

In North America, this is due to the ability of the females of some species to store sperm in the oviduct for at least eight months, and the males ( all species of which undergo spermatogenesis during the summer ) to store sperm in the vas deferens for at least a year.

A spermatocyte is a male gametocyte, derived from a spermatogonium, which is in the developmental stage of spermatogenesis during which meiosis occurs.

Testicular failure includes absence of failure production as well as low production and maturation arrest during the process of spermatogenesis.

`` All right, if you can't do your arithmetic during school hours you can do it after school is out '', Miss Langford said firmly, not smiling.

Nowhere in Isfahan is this rich aesthetic life of the Persians shown so well as during the promenade at the Khaju bridge.

That this abandonment takes place on a stage, during an ' artistic ' performance, is enough to associate Jacoby with art, and to bring down upon him the punishment for art ; ;

It is of the utmost importance to the people of America and of the world how their governing President `` ends up '' during the four years of his term.

This is the good kind of sophistication, and with all our problems and crises this kind of sophistication has flowered in the United States during recent years.

It is not implied that formal principles and procedures are so firmly entrenched within the public order of the world community or even of free commonwealths that they will control in all circumstances involving Jews and Gentiles during coming years.

In any event, the critical productivity of that time is abundant proof that if he was taking laudanum, it was never in command of him to the extent that it had been during his vagrant years.

The entire exercise, Latin and English, is most suggestive of the kind of person Milton had become at Christ's during his undergraduate career ; ;

Considering then the optimism which has permeated science fiction for so long, what is really remarkable is that during the last twelve years many science-fiction writers have turned about and attacked their own cherished vision of the future, have attacked the Childhood's End kind of faith that science and technology will inevitably better the human condition.

`` The cannery '', said Mrs. Lewellyn Lundeen, an active booster of the cannery since its opening during the war and rationing years of 1941, to handle the `` victory garden '' produce, `` is a service to the taxpayer.

This is the period during the melancholy days of autumn when universities and colleges schedule what they call `` Homecoming Day ''.

If they are to be commended for foresight in their planning, what then is the judgment of a town council that compounds this problem during the planning stage??

The 15th Street deposit is not to be confused with the nearby famous Mayflower Hotel cypress swamp on 17th Street reported in The Washington Post, August 2, 1955, which was probably formed during the second interglacial period and is therefore much younger.

A 5-percent royalty is paid on any production during the period the contract is in effect ; ;

One indication of the merits of the new management is found in the fact that during the period 1951-1956, while total annual mileage put on the vehicles increased 35%, the total maintenance cost increased only 11%.

A significant effect discovered during the study is the existence of Prandtl numbers reaching values of more than unity in the nitrogen dissociation region.

The pre-1960 rate of Federal participation with respect to any State's base allotment, as well as the adjusted rate in effect during the 1960 - 1962 period, is designated by the statute as that State's `` adjusted Federal Share ''.

At that time consideration will be given to whether in the light of the United States supplies of rice available for Title 1, disposal, India's production, consumption and stocks of food grains, other imports from the United States and countries friendly to the United States, India's storage capacity, and other related factors, any increase would be possible in the portion of the total rice programmed which is currently planned for procurement during the first year.

during the same period around sunrise, skywave transmission is declining, until at about 2 hours after sunrise it reaches a point where it becomes of little practical significance.

Essentially, the question presented for decision in the present Daytime Skywave proceeding is whether our decision ( in 1938-1939 ) to assign stations on the basis of daytime conditions from sunrise to sunset, is sound as a basis for AM allocations, or whether, in the light of later developments and new understanding, skywave transmission is of such significance during the hours immediately before sunset and after sunrise that this condition should be taken into account, and some stations required to afford protection to other stations during these hours.