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  2. 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 ...

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

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

    A medical tetrad is a group of four, while a pentad is a group of five. Triads. Name Triad Disease Abdominal aortic aneurysm rupture Triad:

  4. Tetrad - Wikipedia

    en.wikipedia.org/wiki/Tetrad

    Tetrad (astronomy), four total lunar eclipses within two years; Tetrad (chromosomal formation) Tetrad (general relativity), or frame field Tetrad formalism, an approach to general relativity; Tetrad (geometry puzzle), a set of four simply connected disjoint planar regions in the plane; Tetrad (meiosis), the four cells produced by meiotic cell ...

  5. Tacticity - Wikipedia

    en.wikipedia.org/wiki/Tacticity

    The definition of tetrads and pentads introduce further sophistication and precision to defining tacticity, especially when information on long-range ordering is desirable. [ citation needed ] Tacticity measurements obtained by carbon-13 NMR are typically expressed in terms of the relative abundance of various pentads within the polymer ...

  6. Bacterial cellular morphologies - Wikipedia

    en.wikipedia.org/wiki/Bacterial_cellular...

    Tetrads are clusters of four cocci arranged within the same plane such as Micrococcus sp.). Sarcina describes a pack-like cuboidal arrangement of eight cocci such as ...

  7. Tetrad (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Tetrad_(astronomy)

    In astronomy, a tetrad is a set of four total lunar eclipses within two consecutive years. [ 1 ] The frequency of tetrads varies by century with the frequency of total lunar eclipses.

  8. Tetractys - Wikipedia

    en.wikipedia.org/wiki/Tetractys

    The tetractys. The tetractys (Greek: τετρακτύς), or tetrad, [1] or the tetractys of the decad [2] is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row, which is the geometrical representation of the fourth triangular number.

  9. Meiosis - Wikipedia

    en.wikipedia.org/wiki/Meiosis

    This is an accepted version of this page This is the latest accepted revision, reviewed on 16 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 ...