tetrad造句
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.
Megaspore
tetrad is linear. The chalazal megaspore develops into an embryo sac of Polygonum type.
大孢子四分体为线形, 合点端功能大孢子发育成为蓼型胚囊.