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Spores of Riccia sorocarpa still associated in tetrads following meiosis. The tetrad is the four spores produced after meiosis of a yeast or other Ascomycota, Chlamydomonas or other alga, or a plant. After parent haploids mate, they produce diploids. Under appropriate environmental conditions, diploids sporulate and undergo meiosis.
A bivalent. In cellular biology, a bivalent is one pair of chromosomes (homologous chromosomes) in a tetrad.A tetrad is the association of a pair of homologous chromosomes (4 sister chromatids) physically held together by at least one DNA crossover.
This is an accepted version of this page This is the latest accepted revision, reviewed on 26 January 2025. Cell division producing haploid gametes For the figure of speech, see Meiosis (figure of speech). For the process whereby cell nuclei divide to produce two copies of themselves, see Mitosis. For excessive constriction of the pupils, see Miosis. For the parasitic infestation, see Myiasis ...
The meiotic cell cycle in plants is very different from that of yeast and animal cells. In plant studies, mutations have been identified that affect meiocyte formation or the process of meiosis. [3] Most meiotic mutant plant cells complete the meiotic cell cycle and produce abnormal microspores. [3]
Micrococcus is a genus of bacteria in the Micrococcaceae family. Micrococcus occurs in a wide range of environments, including water, dust, and soil. Micrococci have Gram-positive spherical cells ranging from about 0.5 to 3 micrometers in diameter and typically appear in tetrads.
They are helical in shape and contain guanine tetrads that can form from one, [3] two [4] or four strands. [5] The unimolecular forms often occur naturally near the ends of the chromosomes, better known as the telomeric regions, and in transcriptional regulatory regions of multiple genes, both in microbes [ 6 ] [ 7 ] and across vertebrates [ 8 ...
Tetrad (meiosis), the four cells produced by meiotic cell division; Tetrad (music), a set of four notes; Tetrad (symbol), or tetractys, a triangular figure of ten points arranged in four rows, and mystical symbol; Medical tetrad, a group of four signs or symptoms which characterise a specific medical condition; Nibble, or tetrade, a 4-bit group
Synapsis during Meiosis. The circled area is the part where synapsis occurs, where the two chromatids meet before crossing over. Synapsis or Syzygy is the pairing of two chromosomes that occurs during meiosis.