1、In genetics, a tetrad refers to a group of four chromatids, which are formed during meiosis.
在遗传学中，四联体指的是在减数分裂过程中形成的四个染色单体的群体。
2、A tetrad can also refer to a group of four microorganisms, such as bacteria or yeast, that are arranged together.
四联体还可以指一组由四个微生物（如细菌或酵母）组成的群体，它们排列在一起。