MIS |
Meiosis-Inducing Substance |
|---|---|
MIS |
management information system; medical information service; meiosis-inducing substance; minimally in... |
MI |
Meiosis I |
|---|---|
MII |
Meiosis II |
MAS |
Meiosis activating sterols |
meiosis |
A specialised form of nuclear division in which there two successive nuclear divisions (meiosis I and II) without any chromosome replication between them. Each division can be divided into 4 phases similar to those of mitosis pro, meta, ana and telophase). Meiosis reduces the starting number of 4n chromosomes in the parent cell to n in each of the 4 daughter cells. Each cell receives only one of each homologous chromosome pair, with the maternal and paternal chromosomes being distributed randomly between the cells. This is vital for the segregation of genes. During the prophase of meiosis I (classically divided into stages: Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis), homologous chromosomes pair to form bivalents, thus allowing crossing over, the physical exchange of chromatid segments. This results in the recombination of genes. Meiosis occurs during the formation of gametes in animals, which are thus haploid and fertilization gives a diploid egg. In plants meiosis leads to the formation of the spore by the sporophyte generation. (18 Nov 1997) |
|---|
Synonyms : Meiotic M Phase, Meioses
|
meiosis
|
(genetics) cell division that produces reproductive cells in sexually reproducing organisms; the nucleus divides into four nuclei each containing half the chromosome number (leading to gametes in animals and spores in plants) litotes: understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary); "saying `I was not a little upset' when you mean `I was very upset' is an example of litotes"
출처: wordnet.princeton.edu/perl/webwn
|
|---|---|
|
meiosis
|
Meiosis (a Greek word meaning "decrease") is a cellular process that forms the basis for sexual reproduction, together with syngamy. It is a form of nuclear division by which a diploid parent produces four haploid daughter cells. The process includes the two stages of nuclear division (meiosis I and II), each usually accompanied by cell division. Single-stage meiosis has been suggested but not convincingly demonstrated. ...
출처: en.wikipedia.org/wiki/Meiosis
|
|
meiosis
|
A special form of cell division in which each daughter cell receives half the amount of DNA as the parent cell. Meiosis occurs during formation of egg and sperm cells in mammals.
출처: www.stjude.org/glossary
|
|
meiosis
|
(Gr. meioun, to make smaller) The special cell division process by which the chromosome number of a reproductive cell becomes reduced to half (n) the diploid (2n) or somatic number. Two consecutive divisions occur. In the first division, homologous chromosomes became paired and may exchange genetic material (via crossing over) before moving away from each other into separate daughter nuclei (reduction division). These new nuclei divide by mitosis to produce four haploid nuclei. ...
출처: www.fao.org/docrep/003/X3910E/X3910E16.htm
|
|
meiosis
|
The process in which a eukaryotic nucleus divides into nuclei whose ploidy is lower than that of the parent nucleus (typically, haploid nuclei being formed from diploid nuclei) and in which recombination usually occurs. (16)
출처: ppathw3.cals.cornell.edu/glossary/Defs_M.htm
|