Definitions for meiosis
maɪˈoʊ sɪsmeio·sis

Princeton's WordNetRate this definition:0.0 / 0 votes

1. meiosis, miosis, reduction divisionnoun

   (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)

2. litotes, meiosisnoun

   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"

GCIDERate this definition:0.0 / 0 votes

1. Meiosisnoun

   (Cell Biology) The cellular process by which a diploid progenitor cell forms haploid gametes, including a division of one diploid cell into two cells, each with one of the homologous sets of chromosomes.

2. Meiosisnoun

   (Rhet.) Diminution; a species of hyperbole, representing a thing as being less than it really is; understatement; see also litotes.

WiktionaryRate this definition:0.0 / 0 votes

1. meiosisnoun

   A figure of speech whereby something is made to seem smaller or less important than it actually is.

2. meiosisnoun

   Cell division of a diploid cell into four haploid cells, which develop to produce gametes.

WikipediaRate this definition:0.0 / 0 votes

1. Meiosis

   Meiosis ( (listen); from Ancient Greek μείωσις (meíōsis) 'lessening', since it is a reductional division) is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately result in four cells with only one copy of each chromosome (haploid). Additionally, prior to the division, genetic material from the paternal and maternal copies of each chromosome is crossed over, creating new combinations of code on each chromosome. Later on, during fertilisation, the haploid cells produced by meiosis from a male and female will fuse to create a cell with two copies of each chromosome again, the zygote. Errors in meiosis resulting in aneuploidy (an abnormal number of chromosomes) are the leading known cause of miscarriage and the most frequent genetic cause of developmental disabilities.In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells, each with half the number of chromosomes as the original parent cell. The two meiotic divisions are known as meiosis I and meiosis II. Before meiosis begins, during S phase of the cell cycle, the DNA of each chromosome is replicated so that it consists of two identical sister chromatids, which remain held together through sister chromatid cohesion. This S-phase can be referred to as "premeiotic S-phase" or "meiotic S-phase". Immediately following DNA replication, meiotic cells enter a prolonged G2-like stage known as meiotic prophase. During this time, homologous chromosomes pair with each other and undergo genetic recombination, a programmed process in which DNA may be cut and then repaired, which allows them to exchange some of their genetic information. A subset of recombination events results in crossovers, which create physical links known as chiasmata (singular: chiasma, for the Greek letter Chi (Χ)) between the homologous chromosomes. In most organisms, these links can help direct each pair of homologous chromosomes to segregate away from each other during meiosis I, resulting in two haploid cells that have half the number of chromosomes as the parent cell. During meiosis II, the cohesion between sister chromatids is released and they segregate from one another, as during mitosis. In some cases, all four of the meiotic products form gametes such as sperm, spores or pollen. In female animals, three of the four meiotic products are typically eliminated by extrusion into polar bodies, and only one cell develops to produce an ovum. Because the number of chromosomes is halved during meiosis, gametes can fuse (i.e. fertilization) to form a diploid zygote that contains two copies of each chromosome, one from each parent. Thus, alternating cycles of meiosis and fertilization enable sexual reproduction, with successive generations maintaining the same number of chromosomes. For example, diploid human cells contain 23 pairs of chromosomes including 1 pair of sex chromosomes (46 total), half of maternal origin and half of paternal origin. Meiosis produces haploid gametes (ova or sperm) that contain one set of 23 chromosomes. When two gametes (an egg and a sperm) fuse, the resulting zygote is once again diploid, with the mother and father each contributing 23 chromosomes. This same pattern, but not the same number of chromosomes, occurs in all organisms that utilize meiosis. Meiosis occurs in all sexually-reproducing single-celled and multicellular organisms (which are all eukaryotes), including animals, plants and fungi. It is an essential process for oogenesis and spermatogenesis.

ChatGPTRate this definition:0.0 / 0 votes

1. meiosis

   Meiosis is a type of cell division that occurs in sexually reproducing organisms, resulting in the production of gametes (such as sperm or egg cells) with half the number of chromosomes as the parent cell. This process consists of two rounds of division, meiosis I and meiosis II, and enables genetic variation through recombination and random assortment of chromosomes.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Meiosisnoun

   diminution; a species of hyperbole, representing a thing as being less than it really is

2. Etymology: [NL., fr. Gr. mei`wsis, fr. meioy^n to make smaller, from mei`wn. See Meionite.]

WikidataRate this definition:0.0 / 0 votes

1. Meiosis

   Meiosis is a special type of cell division necessary for sexual reproduction in eukaryotes. The cells produced by meiosis are gametes or spores. In many organisms, including all animals and land plants, gametes are called sperm and egg cells. Whilst the process of meiosis bears a number of similarities with the 'life-cycle' cell division process of mitosis, it differs in two important respects: Meiosis begins with one diploid cell containing two copies of each chromosome—one from the organism's mother and one from its father. The cell divides twice, potentially producing up to four haploid cells containing one copy of each chromosome. In animals the haploid cell resulting from meiosis is a male or female gamete. Each of the resulting chromosomes in the gamete cells is a unique mixture of maternal and paternal DNA, resulting in offspring that are genetically distinct from either parent. This gives rise to genetic diversity in sexually reproducing populations. This genetic diversity can provide the variation of physical and behavioural attributes upon which natural selection can act.

Chambers 20th Century DictionaryRate this definition:0.0 / 0 votes

1. Meiosis

   mī-ō′sis, n. (rhet.) a figure of speech representing a thing as less than it is. [Gr.]

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Meiosis

   A type of CELL NUCLEUS division, occurring during maturation of the GERM CELLS. Two successive cell nucleus divisions following a single chromosome duplication (S PHASE) result in daughter cells with half the number of CHROMOSOMES as the parent cells.

Matched Categories

1. • Rhetorical Device
   • Understatement

Usage in printed sourcesFrom: 

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How to pronounce meiosis?

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How to say meiosis in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of meiosis in Chaldean Numerology is: 6

2. Pythagorean Numerology

   The numerical value of meiosis in Pythagorean Numerology is: 8

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=meiosis
2. ^ GCIDE
   https://gcide.gnu.org.ua/?q=meiosis
3. ^ Wiktionary
   https://en.wiktionary.org/wiki/Meiosis
4. ^ Wikipedia
   https://en.wikipedia.org/wiki/Meiosis
5. ^ ChatGPT
   https://chat.openai.com
6. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/meiosis
7. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=meiosis
8. ^ Chambers 20th Century Dictionary
   https://www.gutenberg.org/files/37683/37683-h/37683-h.htm#:~:text=meiosis
9. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=meiosis