meiosis


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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.
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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 ?
Making sperm and eggs, and then eventually the next generation depends upon a special kind of cell division known as meiosis.
Emanuel Syndrome (ES) is a genetic disorder caused by the presence of supernumerary derivative (der)(22) translocation(t)(11;22) due to an inherited chromosomal imbalance through 3:1 segregation during meiosis I, of a reciprocal translocation (11;22) from one of the progenitors (1).
SYCP2 and SYCP3 replaced Hop1 and Red1 in animals, although HORMA domain-containing proteins are also active in their meiosis [54].
Checkpoint mediator proteins Mrc1 (mediator of replication checkpoint), Tof1 (topoisomerase I interacting factor) and Csm3 (chromosome segregation in meiosis) function during DNA replication to activate Rad53, an effector kinase (3).
Los estudios de aspectos reproductivos son mas escasos y se relacionan con el desarrollo de los esporangios y la esporogenesis (Hawkins 1907), el proceso de maduracion de las esporas, el patron de deposito de las capas del esporodermo y la presencia de clorofila en las esporas (Beer 1909), la morfologia y evolucion de esporangioforos y ejes en relacion con el origen y disposicion de estas estructuras (Page 1972), aspectos ultraestructurales de la germinacion de las esporas (Gullvag 1968, Olsen & Gullvag 1973), caracteres de forma, tamano y color de las esporas en relacion con su viabilidad en especies e hibridos (Duckett 1970), distribucion de los organulos, en especial plastidios y mitocondrias, durante la meiosis (Bednara & Rodkiewicz 1985, Bednara et al.
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.
Meiosis is an essential event in the life cycle of all sexually reproducing plants.
Melanomas have also been shown to express meiosis specific proteins including SCP1 (homologous chromosome pairing) [16], HORMAD1 (meiotic synapse regulation) [17], SPO11 (double stranded DNA breaks) [18], and REC8 (meiosis cohesion protein) [2].
The comprehension of the chromosome movement involved in mitosis and meiosis is essential to understanding transmission genetics, but this is often challenging for students in the classroom, especially for students who lack a strong scientific background.
These cells are created through a process of cell division called meiosis (see illustration above).
During meiosis, in order to produce a percentage of abnormal gametes with duplication of the region outside the inversion segment on one arm of the inverted chromosome and deletion of the terminal segment on the other arm, and vice versa, it will end up with duplicated/ deficient recombinant chromosomes distal to the breakpoints.
Description of the profasic chromosome in Meiosis I of Bostryx conspersus