For those wanting to know what the new Snapchat emoji symbols mean, there is several different things that they repersent and these emojis have replaced the âBest Friendsâ feature with Friend Emojis smilies.
(plural tetrads) 1  A group of four things. ( 2 chemistry) A tetravalent atom or radical. ( biology) Two pairs of sister chromatids (a dyad pair) aligned in a certain way and often on the equatorial plane during the meiosis process.
1 a group or set of four. 2  Bot. a group of four cells formed by division within a spore mother cell during meiosis. 3  Chem. an atom, radical, or element that is tetravalent.  Genetics a group of four similar chromatids formed by the longitudinal division of a pair of homologous chromosomes during meiotic prophase.