Definitions for zygotene
ˈzaɪ gəˌtin, ˈzɪg ə-zy·gotene

Princeton's WordNetRate this definition:0.0 / 0 votes

1. zygotenenoun

   the second stage of the prophase of meiosis

WiktionaryRate this definition:0.0 / 0 votes

1. zygotenenoun

   The intimate pairing of homologous chromosomes during the synaptic stage of meiosis

2. Etymology: zyg- 'union, zygosis' (from (zygon) 'junction, yoke') + -tene 'filament' (from (tainia) 'band, fillet')

WikipediaRate this definition:0.0 / 0 votes

1. zygotene

   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. zygotene

   Zygotene is a stage of meiosis, specifically in Prophase I, where homologous chromosomes pair up with each other and begin the process of crossing over, a genetic recombination that results in each chromosome carrying genetic information from both parents. The pairs of chromosomes are also known as bivalents or tetrads during this stage. This state is crucial for ensuring the correct separation and distribution of chromosomes in later stages.

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1. • Phase

How to pronounce zygotene?

1. Alex

   US English

   David

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   Mark

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   Daniel

   British

   Libby

   British

   Mia

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   Karen

   Australian

   Hayley

   Australian

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   Indian

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   Neerja

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   South African

How to say zygotene in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of zygotene in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of zygotene in Pythagorean Numerology is: 9

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=zygotene
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Zygotene
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Zygotene
4. ^ ChatGPT
   https://chat.openai.com