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.
chromosomes that have the same sequence of genes, that have the same structured, and that pair during meisosis prophase I each replicated chromosome pairs with its corresponding homologous chromosome, forms tetrad of 4 chromatids. crossing over occurs