meioticsyzygymeiosis Imeiosis IIprophase Imetaphase Ipachytenemetaphase IImeioticallydiakinesis
Meiosis (from Greek μείωσις, meiosis, which means lessening) is a specialized type of cell division that reduces the chromosome number by half, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them.wikipedia
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It can occur during meiosis or replication of DNA, as well as due to ionizing or UV radiation, transposons, mutagenic chemicals, viruses and a number of other factors.
Cytogenetics is a branch of genetics that is concerned with how the chromosomes relate to cell behaviour, particularly to their behaviour during mitosis and meiosis.
There are three forms of nondisjunction: failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II, and failure of sister chromatids to separate during mitosis.
Once released, the unsporulated oocysts undergo meiosis upon contact with oxygen and moisture.
Most eukaryotes have diploid somatic cells, but produce haploid gametes (eggs and sperm) by meiosis.
The meiotic recombination checkpoint monitors the meiotic recombination during meiosis, and blocks the entry into metaphase I if the recombination is not efficiently processed.
In addition to frustule morphology the genus differs from closely related species by its sexual reproduction and movement in response to light.
Genetic linkage is the tendency of DNA sequences that are close together on a chromosome to be inherited together during the meiosis phase of sexual reproduction.
genomehuman DNAhuman geneticist
Haploid human genomes, which are contained in germ cells (the egg and sperm gamete cells created in the meiosis phase of sexual reproduction before fertilization creates a zygote) consist of three billion DNA base pairs, while diploid genomes (found in somatic cells) have twice the DNA content.
One of those ideas was the notion of genetic recombination by crossing-over during meiosis—a mechanism by which chromosomes exchange information.
UPD can be the result of heterodisomy, in which a pair of non-identical chromosomes are inherited from one parent (an earlier stage meiosis I error) or isodisomy, in which a single chromosome from one parent is duplicated (a later stage meiosis II error).
Polysomy is usually caused by non-disjunction (the failure of a pair of homologous chromosomes to separate) during meiosis, but may also be due to a translocation mutation (a chromosome abnormality caused by rearrangement of parts between nonhomologous chromosomes).
SMCSMC (structural maintenance of chromosome)SMC (structural maintenance of chromosomes) proteins
For instance, mammals have a meiosis-specific variant of SMC1, known as SMC1β.
In molecular biology, the protein domain, YTH refers to a member of the YTH family that has been shown to selectively remove transcripts of meiosis-specific genes expressed in mitotic cells.
cytokinescytokineticactin-myosin contractile ring
Cytoplasmic division begins during or after the late stages of nuclear division in mitosis and meiosis.
The active movement of kinesins supports several cellular functions including mitosis, meiosis and transport of cellular cargo, such as in axonal transport.
The parasexual cycle, a process peculiar to fungi and single-celled organisms, is a nonsexual mechanism of parasexuality for transferring genetic material without meiosis or the development of sexual structures.
genetic memoryrecipesepigenetic memory
If this memory is recorded in the genetic material and stably inherited through cell division (mitosis or meiosis), it is genetic memory.
The tetrad is the four spores produced after meiosis of a yeast or other Ascomycota, Chlamydomonas or other alga, or a plant.
spindle assembly checkpointbipolar orientationbipolarity
In humans, Down syndrome appears in children carrying in their cells one extra copy of chromosome 21, as a result of a defect in chromosome segregation during meiosis in one of the progenitors. This defect will generate a gamete (spermatozoide or oocyte) with an extra chromosome 21. After fertilisation, this gamete will generate an embryo with three copies of chromosome 21.
Syzygy, in biology, the pairing of chromosomes during meiosis
common bambooB. vulgarisBamboo
Fruits are rare due to low pollen viability caused by irregular meiosis.
A megaspore mother cell, or megasporocyte, is a diploid cell in plants in which meiosis will occur, resulting in the production of four haploid megaspores.
The degree of relative consanguinity can be illustrated with a consanguinity table in which each level of lineal consanguinity (generation or meiosis) appears as a row, and individuals with a collaterally consanguineous relationship share the same row.