At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.此时每条染色体由一对染色单体构成,这两条联合的染色体称为四分体.Microspore abortion occurred after the tetrad formation.小孢子败育发生在四分体形成以后...
However, backflow may now be creating other side effects.不过, 眼下回流可能正在引发其它一些负面影响.From this causes two backflow agitation efficiency not high substantial clause.由此引起二次回流搅动效率不高的重要原因.Backflow preventer manufactured from 300 ...