Tetrad
Encyclopedia
Tetrad may refer to:
  • Tetrad (chromosomal pairing), Bivalents or Tetrad of homologous chromosomes consisting of four synapsed chromatids that become visible during the Pachytene stage of meiotic prophase
  • Tetrad (pollen formation), group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis
  • Tetrad (genetics)
    Tetrad (genetics)
    The tetrad is the four spores of a yeast or Chlamydomonas, that separate after mating. If the two parents have a mutation in two different genes, the tetrad can segregate as the parental ditype , the non-parental ditype or as the tetratype ....

    , the four spores of a yeast
  • Tetrad (general relativity), a mathematical frame of reference in general relativity
  • Tetractys
    Tetractys
    The tetractys , or tetrad, is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row...

     (or Tetrad), (Greek philosophy)
  • Tetrad (index notation), a concept in differential geometry
  • Tetrad (music)
    Tetrad (music)
    A tetrad is a set of four notes in music theory. When these four notes form a tertian chord they are more specifically called a seventh chord, after the diatonic interval from the root of the chord to its fourth note...

    , a set of four notes
  • Tetrad (unit of area)
    Tetrad (unit of area)
    A tetrad is an area 2 km x 2 km square. The term has a particular use in connection with the British Ordnance Survey national grid, and then refers to any of the 25 such squares which make up a standard hectad....

    , an area 2km x 2km square
  • Tetromino
    Tetromino
    A tetromino is a geometric shape composed of four squares, connected orthogonally. This, like dominoes and pentominoes, is a particular type of polyomino...

    , a shape composed of four squares
  • Tetrad of media effects
    Tetrad of media effects
    Generally speaking, a tetrad is any set of four things. In Laws of Media and The Global Village , published posthumously, Marshall McLuhan summarized his ideas about media in a concise tetrad of media effects...

    , a pedagogical tool
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