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.
Metaphase I. The second phase of meiosis I. the paired homologous chromsomes (tetrads) align at the center of the cell (the metaphase plate). Anaphase I. The third phase of meiosis I. the replicated homologous chromosomes are separated (the tetrad is split) and pulled to opposite sides of the cell. Telophase I Chromosomes move all the way to the other side of the cell and two new cells are ultimately formed.