tetrad

(noun)

two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process

Related Terms

  • chromatid
  • crossing over

Examples of tetrad in the following topics:

  • Comparing Meiosis and Mitosis

    • Chiasmata develop and crossover occurs between homologous chromosomes, which then line up along the metaphase plate in tetrads with kinetochore fibers from opposite spindle poles attached to each kinetochore of a homolog in a tetrad.
    • When the tetrad is broken up and the homologous chromosomes move to opposite poles, the ploidy level is reduced from two to one.
  • Meiosis I

    • At the end of prophase I, the pairs are held together only at the chiasmata; they are called tetrads because the four sister chromatids of each pair of homologous chromosomes are now visible.
    • At the end of prometaphase I, each tetrad is attached to microtubules from both poles, with one homologous chromosome facing each pole.
    • During metaphase I, the tetrads move to the metaphase plate with kinetochores facing opposite poles.
    • In each cell that undergoes meiosis, the arrangement of the tetrads is different.
  • Deinococcus and Thermus

    • Four cells normally stick together, forming a tetrad .
  • Deirdre McCloskey

    • "Like other arts and sciences, that is, economics uses the whole rhetorical tetrad: fact, logic, metaphor, and story.
    • The allegedly scientific half of the tetrad, the fact and logic, falls short of an adequate economic science, or even a science of rocks or stars.
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