meiosis


Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
click for a larger image
meiosis
top to bottom:In meiosis a parent cell replicates and recombines, divides once to create two daughter cells, then divides again creating four daughter cells, each of which has half the genetic content of the original parent cell.

mei·o·sis

 (mī-ō′sĭs)
n. pl. mei·o·ses (-sēz′)
1. Genetics The process of cell division in sexually reproducing organisms that reduces the number of chromosomes from diploid to haploid, as in the production of gametes.
2. Rhetorical understatement.

[Greek meiōsis, diminution, from meioun, to diminish, from meiōn, less; see mei- in Indo-European roots.]

mei·ot′ic (-ŏt′ĭk) adj.
mei·ot′i·cal·ly adv.

meiosis

(maɪˈəʊsɪs)
n, pl -ses (-ˌsiːz)
1. (Biology) a type of cell division in which a nucleus divides into four daughter nuclei, each containing half the chromosome number of the parent nucleus: occurs in all sexually reproducing organisms in which haploid gametes or spores are produced. Compare mitosis See also prophase2
2. (Rhetoric) rhetoric another word for litotes
[C16: via New Latin from Greek: a lessening, from meioun to diminish, from meiōn less]
meiotic adj
meiˈotically adv

mei•o•sis

(maɪˈoʊ sɪs)

n.
1. part of the process of gamete formation in sexual reproduction consisting of chromosome conjugation and two cell divisions after which the chromosome number is reduced by half. Compare mitosis.
2. expressive understatement, esp. litotes.
[1580–90; < Greek meíōsis a lessening =meiō-, variant s. of meioûn to lessen (derivative of meíōn less) + -sis -sis]
mei•ot•ic (maɪˈɒt ɪk) adj.
click for a larger image
meiosis
In early prophase, chromosomes line up to form pairs, centrioles move toward opposite ends of the cell, and the membrane surrounding the nucleus disappears. In late prophase, the chromatids line up along the center of the cell. During metaphase, each member of a chromatid pair becomes attached to spindle fibers from opposite ends of the cell. In anaphase, the chromosomes from each chromatid pair separate and begin to move toward opposite ends of the cell. During telophase, the cell divides into two new daughter cells, each with half the original number of chromosomes. In second telophase, each of the two daughter cells from the first division divides again to produce a total of four daughter cells, each having just a single set of chromosomes.

mei·o·sis

(mī-ō′sĭs)
A type of cell division, occurring in two phases, that reduces the number of chromosomes in reproductive cells to half the original number. It results in the production of reproductive cells (called gametes) in animals and the formation of spores in plants, fungi, and most algae. The first phase of meiosis involves duplication and then separation of the chromosomes, followed by division into two daughter cells that each contain half the number of chromosomes as the original cell. In the second phase, each daughter cell divides to form an additional reproductive cell. See Note at mitosis.

meiosis

an expressive understatement, especially litotes. — meiotic, adj.
See also: Rhetoric and Rhetorical Devices
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.meiosis - (genetics) cell division that produces reproductive cells in sexually reproducing organismsmeiosis - (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)
genetic science, genetics - the branch of biology that studies heredity and variation in organisms
anaphase - the stage of meiosis or mitosis when chromosomes move toward opposite ends of the nuclear spindle
cell division, cellular division - the process in reproduction and growth by which a cell divides to form daughter cells
cytokinesis - organic process consisting of the division of the cytoplasm of a cell following karyokinesis bringing about the separation into two daughter cells
karyokinesis - organic process consisting of the division of the nucleus of a cell during mitosis or meiosis
metaphase - the second stage of meiosis
nondisjunction - meiosis in which there is a failure of paired homologous chromosomes to separate; results in an abnormal number of chromosomes in the daughter cells
prophase - the first stage of meiosis
segregation - (genetics) the separation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes
telophase - the final stage of meiosis when the chromosomes move toward opposite ends of the nuclear spindle
2.meiosis - 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"
understatement - a statement that is restrained in ironic contrast to what might have been said
rhetorical device - a use of language that creates a literary effect (but often without regard for literal significance)
Translations
meióza
Meiose
meioosi
meiózis
meiose

meiosis

[maɪˈəʊsɪs] N (meioses (pl)) [maɪˈəʊsiːz]
1. (Bio) → meiosis f
2. (= litotes) → lítote f

meiosis

n pl <-ses> (Biol) → Meiose f

meiosis

[maɪˈəʊsɪs] nmeiosi f

mei·o·sis

n. meiosis, proceso de subdivisión celular que resulta en la formación de gametos.
References in periodicals archive ?
Objective: During meiosis, recombination (crossing-over, CO) drives the exchange of genetic materials and releases genetic diversity by creating new combinations of alleles within and among chromosomes.
When homozygous, these mutations interrupt meiosis so that
After meiosis II numerous tetrads of microspores appear, tetrad shape is tetrahedral and the wall formation taking place after each stage of meiosis.
Asexual males then spread the genetic elements for suppressing meiosis, the type of cell division necessary for sexual reproduction, into sexual populations.
Besides understanding the role of KASH5, this finding also helps to gain greater insight into the process of meiosis, which may have potential implications for our understanding of infertility," said Dr Horn.
They cover the structure and protein interactions of the nuclear envelope; the nucleocytoplasmic barrier and beyond in the plant nuclear pore complex; the functional organization of filaments in the nucleus; genomics and chromatic packaging; heterochromatic positioning and nuclear architecture; the structure, dynamics, and function of telomeres in plant meiosis, and the nuclear pore complex in symbiosis and pathogen defense.
Neither males nor meiosis (cell division to produce sperm or eggs) have ever been observed in a bdelloid rotifer.
Meiosis differs significantly from mitosis in that it reduces the number of chromosomes in half to produce haploid gametes: the egg and sperm.
Triploidy was induced by inhibiting meiosis II (blocking the extrusion of polar body 2) using the hypotonic shock method (Wang et al.
Most of the CYP21A2 mutations of the 15 loci identified thus far are due to small-scale conversions from CYP21A1P during both meiosis and mitosis (2).