( reduction division) The eukaryotic cell division process used in producing haploid gametes from diploid cells. Meiosis is characterized by a reduction division which ensures that each gamete contains one representative of each pair of autosomes and half the sex chromosomes.
Specialized cell division associated with gamete production. It consists of two divisions, one of which is reductional in terms of chromosome number and the other, equational. Meiosis produces genetically different gametes in a heterozygote having one-half of the genetic material of the original cell.
Reduction division resulting in the production of haploid gametes; a process consisting of two specialized nuclear divisions ultimately leading to the formation of eggs or sperm.
two successive nuclear divisions of a diploid nucleus to form haploid gametes having one half the genetic material of the parent cell.
Special type of cell division by which eggs and sperm cells are made involving reduction from a diploid (double) to a haploid (single) chromosome set. Two successive nuclear divisions with only one round of DNA replication generate four haploid cells daughter cells from the initial diploid cell. (From Greek, meiosis, diminution.)
(my oh´ sis) [Gr.: diminution] • Division of a diploid nucleus to produce four haploid daughter cells. The process consists of two successive nuclear divisions with only one cycle of chromosome replication.
phase of the cell cycle inw hich an original progenitor cell replicates it genetic information and redistributes to offspring cell in such a fashion as to produce haploid daughter cells; the formation in diploid organisms of gamete cells; reduction division.
division occuring only in production of germ cells where there is a reduction in the number of chromosomes. Note all other cells divide by mitosis. (More? Week 1 Notes)
the form of cell division occurring in specialized tissues in the testes and ovary that leads to the production of gametes.
the process by which germ cells (i.e. reproductive cells from the ovary or the testes) divide to produce haploid gametes (i.e. which contain only one set of chromosomes which results from the recombination between the maternal and paternal chromosome set).
A two-stage type of cell division in sexually reproducing organisms. In meiosis, a diploid cell divides to produce four haploid cells, each with half the original chromosome content. For this reason, meiosis is often called a "reduction division". In organisms with a diploid life cycles, the products of meiosis are usually called gametes. In organisms with an alternation of generations, the products of meiosis are caled spores.
a form of nuclear division in which the content of the nucleus is halved (from diploid to haploid), e.g. in gamete formation. Compare mitosis.
Splitting of diploid cells into haploid cells, which produces gametes.
A process within the cell nucleus that results in the reduction of the chromosome number from diploid (two copies of each chromosome) to haploid (a single copy) through two reductive divisions in germ cells.
the type of cell division that occurs in sex cells during gamete formation; the diploid parent cell undergoes two rounds of division, generating a total of four daughter cells, each of which is haploid and genetically unique.
Takes place when cells divide during the formation of gametes. Results in the formation of haploid cells.
the process of chromosome splitting during the formation of sperm and eggs that reduces the number of chromosomes in half, from 46 chromosomes in two sets (2n) to 23 chromosomes in one set (1n).
A two-stage type of cell division in sexually reproducing organisms that results in gametes with half the chromosome number of the original cell.
the type of cell division that occurs only in the ovaries and testicles, producing cells with half the genes of the original cell; these cells then form eggs and sperm
The process of cell division (twice) in a germ cell progenitor, resulting in 4 daughter cells, each with a haploid set of chromosomes (23 chromosomes in humans).
The special cell division which only takes place in reproductive cells and results in egg and sperm cells which contain 23 chromosomes (the haploid number).
cell division without chromosome duplication, resulting in offspring with haploid chromosomes
A process of two nuclear divisions by which diploid cells are converted to haploid gametes.
a type of cell division in which the ovaries or testicles produce haploid egg and sperm.
Process whereby four haploid germ cells (gametes) are produced from a diploid parent cell for sexual reproduction. During meiosis crossovers occur between homologous chromosomes so that each chromosome found in the gamete consists of a patchwork of material from both members of the pair.
A type of cellular reproduction that results in the formation of four haploid cells from one diploid cell. Contains two cellular divisions, meiosis I and meiosis II, that follow only one round of DNA replication. Meiosis produces germ cells.
Process involved in the formation of gametes (reproductive cells), wherein cell division produces new cells (spermatozoa and ova) containing only one set of chromosomes.
The process of nuclear division associated with the formation of gametes or of haploid cells from a diploid.
The process that reduces or halves the number of chromosomes to produce haploid gametes (eggs or sperm) from their diploid progenitor cells (oogonia or spermatogonia).
a reduction division, producing daughter cells that contain half the genetic information of the parent cell.
the process by which the chromosome number is halved during gamete formation.
process that produces gamete; cells with half the number of chromosomes as the organism's normal body cells
The process of cell division that results in the formation of haploid cells from diploid cells to produce gametes.
The process of cell division that occurs in the maturation of sperm and ova that decreases their number of chromosomes by one-half.
Cell division process in diploid organisms that involves the fusion of chromosomes. The gametes that are produced have half the number of chromosomes in comparison to the original cell.
Cell division in the specialized tissues of ovaries and testes that results in the production of sperm or eggs, which contain half the number (23 in humans) of chromosomes found in somatic cells. During fertilization, the nuclei of the sperm and egg fuse to produce a zygote with the full number of chromosomes (46 in humans).
Cell division that produces gametes with half the normal somatic chromosome complement.
The process by which the diploid chromosome number (46 chromsomes = 23 pairs in humans) is reduced to haploid (23 unpaired chromosomes) during the formation of gametes. Meiosis involves a single round of DNA replication followed by two rounds of cell division. During the first meiotic division, homologous chromosomes pair, allowing recombination to occur and ensuring that one member of each pair segregates into each of the daughter cells.
Reproductive cell division that results in egg & sperm.
cell division that forms reproductive cells.
level: Comprehensive (3) [ order by level] The fundamental mechanism of cell division and reduction in the number of chromosomes that makes it possible for species to reproduce sexually.
order by term] level: Comprehensive (3) The fundamental mechanism of cell division and reduction in the number of chromosomes that makes it possible for species to reproduce sexually.
A two-part cell division process in organisms that sexually reproduce, which results in gametes with one-half the number of chromosomes of the parent cell.
(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)
The form of cell division by which egg and sperm cells are formed. Unlike normal cell division (mitosis) the number of chromosomes in the resulting cells is half that in the original cells.
A special process of nuclear division during which spores are produced. Meiosis involves a diminution (by half) in the amount of genetic material; it consists of two successive nuclear divisions with only one round of DNA replication producing four haploid daughter cells (the spores) from an initial diploid cell.
The process of two successive nuclear divisions through which segregation of genes occurs and a single diploid (2n) cell becomes four haploid (n) cells.
Chromosome number-reductional cell divisions in the formation of sexual gametes.
The type of cell division that makes egg and sperm cells.
the division of the genetic information in reproductive cells, so that they have only half the normal number of chromosomes.
The reduction of chromosome number from diploid to haploid in which segregation of genes occurs and gametes or spores are formed.
A special type of cell division that occurs when gametes (spermatozoa and eggs) are formed.Each gamete contains just one version of each gene.
Reproduction in sex cells where the daughter cells produced have half the number of parent chromosomes.
The process by which diploid germ cell precursors segregate their chromosomes into haploid nuclei within eggs and sperm. See Meiosis in the MGI Glossary.
The special cell division at which the diploid complement of chromosomes is halved, leading to formation of the gametes.
The process of cell division in human sperm and egg cells during their development. One cell gives rise to four new daughter cells, which each has 23 chromosomes (it is haploid).
The cell division process where haploid sex cells are formed from diploid germ cells.
Process whereby a cell nucleus divides in two divisions into four nuclei, each containing half the original number of chromosomes.
The process a cell's nucleus must go through to make sex cells (gametes) with half the number of chromosomes present in the original cell.
The two-stage type of cell division that halves the number of chromosomes in a cell. Occurs in sexually-reproducing higher organisms so that the number of chromosomes aren't doubled when fertilisation occurs.
A form of cell division in which the cell's nucleus undergoes two consecutive divisions.
Form of cell division leading to the generation of gametes (sperm or eggs).
The reduction division of the nucleus in which the zygotic number of chromosomes is reduced to the gametic number.
The specialised cell division that takes place when sex cells (sperm or egg cells) are produced. The members of each homologous pair of chromosomes separate from each other so that each sex cell receives only one member of each pair.
A type of nuclear division associated with sexual reproduction, producing four haploid cells from a single diploid cell, the process involving two cycles of division.
A special form of cell division that occurs during the formation of egg and sperm cells in mammals. In meiosis, each of the two "daughter cells" receives half the amount of DNA as the parent cell.
is a process by which the number of chromosomes in a germ cell are halved. In humans, this is normally a reduction from 46 to 23. This happens to an ovum after it is fertilized by a sperm. It happens to sperm before they are released by the testes.
A special type of cell division that produces sex cells each containing half or a haploid set
The stage in which sperm and egg cells are formed. It is during this process that the autosomal chromosomes recombine and mutations occur.
The doubling of gametic chromosome number. Meiosis results in four rather than two daughter cells, each with a haploid set of chromosomes...
cell division in which the daughter cells have half the number of chromosomes as the parent cell.
The type of cell division that leads to the production of sperm and egg cells.
The process of division of sexual cells in which the number of chromosomes in each nucleus is reduced to half the normal number found in normal somatic cells( somatic cell). When two sexual cells fuse, each contributes its half of the chromosomes. The resulting embryo contains the full chromosome complement. Cells with half the chromosomes are called haploids( haploid): those with the normal chromosomal complement, diploids( diploid).
A division process that results in the formation of 4 cells that house half the number of chromosomes as the parent cell. The division reduces the number of sets of chromosomes from two sets (2N) to one set (1N). Leads ultimately to the production of gametes. Meiosis and fertilization are processes involved in sexual reproduction.
Nuclear division that occurs in eukaryotes to produce haploid eggs and spermocytes from a diploid cell. Meiosis consists of two reductive divisions.
Cell division in which the chromosomes replicate, followed by two nuclear divisions. Each of the resulting gametes (in animals, spores in plants) receives a haploid set of chromosomes. Reduction/division by which ploidy, the number of sets of homologous chromosomes, is reduced in the formation of haploid cells that become gametes (or gametophytes in plants). PICTURE
A division of the nucleus that involves the separation of pairs of chromosomes into different cells. Meiosis takes place in the reproductive organs of sexually reproducing organisms. Meiosis involves two nuclear divisions, both of which may take place before division of the cell itself is complete. The eventual result is four cells, each with half the number of chromosomes present in the original cell. Crossing over of chromosomes during meiosis creates new combinations of genes in the progeny that were not present in either adult. For more information see How cells divide: Mitosis versus meiosis (Public Broadcasting Service, USA).
Process of cell reproduction whereby the daughter cells have half the chromosome number of the parent cells. Sex cells are formed by meiosis. Cf. Mitosis.
The cellular process that results in the number of chromosomes in reproductive cells being reduced from 46 to 23. close window
The ordered process of cell division by which the chromosome number is reduced by half. Meiosis is the key element in the production of haploid gametes.
the process of cell division in which a single cell produces four daughter cells each of which contains half of the number of chromosomes of the parent cell. For example, a single diploid spermatogonium (primordial germ cell) will divide meiotically to produce 4 haploid sperm cells.
cellular division that yields four gametes through two cellular divisions
the process by which a cell divides to form two gametes (sperm or egg), which have 1/2 the normal amount of DNA
the process of cell division, where the number of chromosomes is reduced by half, then the new cells divide again by mitosis. Results in four daughter cells.
the particular type of chromosomal division that takes place during the production of sex cells or haploid gametes. In meiotic divisions diploid cells are transformed into haploid cells and new gene combinations are produced on single chromosomes by chiasma formation – the crossing over between chromosome segments.
The process in which a single diploid cell becomes four haploid cells in two consecutive divisions of the nucleus of an eukaryotic cell.
a special cell division during the production of eggs or sperm which results in each daughter nucleus having only one of each pair of chromosomes; when the egg and sperm then unite, pairs are restored.
The process of germ cell formation.
the two-stage division of a diploid nucleus, occurring once in every sexual life cycle, in which gene recombination occurs and the number of chromosomes characteristic of the sporophyte plant is halved prior to the production of gametes.
Cell division producing egg and sperm cells. In the process of division the diploid chromosome compliment is reduced to a haploid one. The meiosis comprises two succeeding nucleus divisions, DNA replication takes place only in one of these cycles. Thus, in the process of meiosis four haploid daughter cells are produced.
the nuclear process in diploid eukaryotes that results in gametes or spores with only one member of each original homologous pair of chromosomes per nucleus
In eukaryotes, a special type of cell division comprising two successive nuclear and cellular divisions with only one round of DNA replication resulting in production of four genetically nonequivalent haploid cells (gametes) from an initial diploid cell. Opp. Mitosis.
The type of nuclear division involved in sexual reproduction. The diploid starting cell gives rise to four haploid gametes.
The process of reducing and dividing the chromosomes in both the sperm and egg, which occurs immediately prior to and during fertilization.
The two-step cellular division of the original germ cells, which reduces the chromosomes from 4nDNA to 1nDNA.
The process of cell division which yields the haploid germ cells or gametes which have half the full chromosomal complement.
A special process of cell division comprising two nuclear divisions in rapid succession that result in four cells (that will become gametes) with the haploid number of chromosomes. (Based on SMD)
The process of two consecutive cell divisions in the diploid progenitors of sex cells. Meiosis results in four rather than two daughter cells, each with a haploid set of chromosomes.
The process of cell division typical only of gametes. During this process, which means "lessening" in Greek, the cell rids itself of its genetic load by throwing off half the original number of chromosomes.
Gr. meiosis - reduction]. Two consecutive nuclear divisions whereby the resultant daughter nuclei contain half the chromosome complement of other somatic cells; occurs at time of gametogenesis. Synonym: reduction division.
a pair of nuclear divisions in quick succession, one of which is reductional. As a result, four haploid nuclei are produced by this process
The production of sex cells, which are not genetically identical, through a series of cell divisions. Compare to mitosis.
Two successive nuclear divisions (with corresponding cell divisions) that produce gametes (in animals) or sexual spores (in plants and fungi) having one-half of the genetic material of the original cell.
A special method of cell division by which the chromosome number of a sex cell becomes reduced to half the diploid number of somatic cells. This results in the formation of gametes and is a vital source of variability through recombination.
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.
Process of "reductive" cell division, occurring in the production of gametes, by means of which each daughter nucleus receives half the number of chromosomes characteristic of the somatic cells of the species RT chromosome, diploid, gamete, haploid See miosis
Cell division in which a cell gives rise to daughter cells with half as many chromosomes.
type of cell division in which a diploid cell divides twice, resulting in haploid germ cells.
cell division by which eggs and sperm are produced.
The reduction division process by which haploid gametes and spores are formed, consisting of a single duplication of the genetic material followed by two mitotic divisions
meiosis] production of haploid cells, usually eggs or sperm, through division of diploid cells, a source of genetic variation.
the cell division process that eggs and sperm go through which halves the chromosome number from 46 to 23.
Cell division in specialized tissues of ovaries and testes which results in the production of sperm or ova. Meiosis involves two divisions and results in four daughter cells, each containing only half the original number of chromosomes--23 in the case of humans. These cells can develop into gametes.
The cell division, peculiar to reproductive cells, which allows genetic material to divide in half. Each new cell will contain twenty-three chromosomes. The spermatids (immature sperm) and ova (eggs) each contain twenty-three chromo-somes, so when they combine (fertilize), the baby will have a normal complement of forty-six.
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)
A special kind of cell division that occurs during the reproduction of diploid organisms to produce the gametes. The double set of genes and chromosomes of the normal diploid cells is reduced during meiosis to a single haploid set in the gametes. Crossing-over and therefore recombination occur during a phase of meiosis.
Meiosis is a process in which an eukaryotic cell's (diploid) nucleus divides twice and produces four daughter cells (called gametes or reproductive cells), each of which have half the genetic complement of the parent cell (they are haploid). This process was named by Farmer and Moore in 1905.
Process of cell division that forms the gametes; normally results in twenty-three chromosomes in each human egg and sperm cell rather than the full complement of forty-six chromosomes.
Process of nuclear division during the generation of sex cell which cuts the number of chromosomes in half
A reproductive process involving two successive divisions of a cell, resulting in four daughter cells. Unlike what occurs in mitosis, the daughter cells produced in meiosis are not identical to each other. Meiosis is the process by which sperm and egg cells are made.
Successive divisions of diploid cell to yield haploid gametes with half number of chromosomes. Prevents the doubling that would otherwise occur on fertilization. Compare mitosis.
In biology, meiosis (IPA: ) is the process that allows one diploid cell to divide in a special way to generate haploid cells in eukaryotes. The word "meiosis" comes from the Greek meioun, meaning "to make smaller," since it results in a reduction in chromosome number.