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.
Crossing over: the exchange of genetic material between homologous chromosomes that occur during meiosis and goes to genetic variability. Tetrad: a 4 part structure during meiosis. Spindle Fiber: protein structures that pull apart genetic material in a cell when it divides. Centrioles: barrel-shaped cell structure that are found in animal eukaryotic cells most of the time.