The time at which the two reductive divisions occur is not necessarily coincident to the time of ovulation . 两次减数分裂的时间不一定与排卵时间相一致。
Observation on meiotic division of pollen mother cell and pollen vigor assessment for four species of ceratoides 驼绒藜属4种植物花粉母细胞减数分裂的观察及花粉活力的测定
Chromomere a small beadlike deeply staining structure seen in chromosomes during prophase of mitosis and meiosis 染色粒:在有丝分裂及减数分裂的前期存在于染色体上的小念珠状的着色深的结构。
Since crossing over can occur during the first meiotic division , it does allow for some genetic variation in the offspring 在第一次减数分裂的过程中可以发生交换现象,因而在后代中有遗传变化。
Chromatid one of a pair of replicated chromosomes found during the prophase and metaphase stages of mitosis and meiosis 染色单体:在有丝分裂和减数分裂的前期和中期一对已经复制了的染色体中的一个。