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  2. List of medical triads, tetrads, and pentads - Wikipedia

    en.wikipedia.org/wiki/List_of_medical_triads...

    Tetrad Disease Tetralogy of Fallot: pulmonary stenosis, ventricular septal defect, right ventricular hypertrophy, overriding aorta: Tetralogy of Fallot Ménière's disease: vertigo, tinnitus, fluctuating low frequency hearing loss, aural fullness: Ménière's disease zoonotic tetrad: scrub typhus, chiggers, rodents and birds, scrub vegetation

  3. Tetrad (meiosis) - Wikipedia

    en.wikipedia.org/wiki/Tetrad_(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. The meiotic products, spores, remain packaged in the parental cell body to produce ...

  4. Bivalent (genetics) - Wikipedia

    en.wikipedia.org/wiki/Bivalent_(genetics)

    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 .

  5. Tetrad test - Wikipedia

    en.wikipedia.org/wiki/Tetrad_test

    The tetrad test is a series of behavioral paradigms in which rodents treated with cannabinoids such as THC show effects. [1] [2] It is widely used for screening drugs that induce cannabinoid receptor-mediated effects in rodents. The four behavioral components of the tetrad are spontaneous activity, catalepsy, hypothermia, and analgesia.

  6. G-quadruplex - Wikipedia

    en.wikipedia.org/wiki/G-quadruplex

    The direct visualization of G-quadruplex structures in human cells [47] as well as the co-crystal structure of an RNA helicase bound to a G-quadruplex [48] have provided important confirmations of their relevance to cell biology. The potential positive and negative roles of quadruplexes in telomere replication and function remains controversial.

  7. Garrod's tetrad - Wikipedia

    en.wikipedia.org/wiki/Garrod's_tetrad

    In medicine, Garrod's tetrad is a term named for British physician Archibald Garrod, who introduced the phrase "inborn errors of metabolism" in a lecture in 1908. [ 1 ] The tetrad comprises four inherited metabolic diseases : albinism , alkaptonuria , cystinuria , and pentosuria .

  8. Micrococcus luteus - Wikipedia

    en.wikipedia.org/wiki/Micrococcus_luteus

    Micrococcus luteus is a Gram-positive to Gram-variable, nonmotile, tetrad-arranging, pigmented, saprotrophic coccus bacterium in the family Micrococcaceae. [1] It is urease and catalase positive. An obligate aerobe , M. luteus is found in soil, dust, water and air, and as part of the normal microbiota of the mammalian skin.

  9. Sordaria fimicola - Wikipedia

    en.wikipedia.org/wiki/Sordaria_fimicola

    These visual mutants aid in tetrad analysis, especially in analysis of intragenic recombination. [1] The most common form of S. fimicola is a dark brown. Certain mutants are grey or tan. A common experiment for an introductory biology lab class is to cross one of the mutant types with a wild type and observe the ratio of coloring in the offspring.