Tetrad

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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), the four spores of a yeast
  • Tetrad (general relativity), a mathematical frame of reference in general relativity
  • Tetractys (or Tetrad), (Greek philosophy)
  • Tetrad (index notation), a concept in differential geometry
  • Tetrad (music), a set of four notes
  • Tetrad (unit of area), an area 2km x 2km square
  • Tetromino, a shape composed of four squares
  • Tetrad of media effects, a pedagogical tool
  • Tetrad (astrology), four total lunar eclipses occurring in a row with intervals of 6 lunations
  • Dark tetrad, group of four undesirable personality traits
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