减数分裂

Among these were one case with double mutations (D21S11 and PentaD) and another case with two different mutations (D7S820 and D16S539) in t...

在3764次减数分裂中，15个STR位点共观察到有72例突变，突变率为0 。128 %±1 。104×10-3.vWA和D21S11的突变率最高(0·292 %)，TH01和TPOX位点没有发现突变。

Based on the biology model, leek is put in the normal paint or water-based environment. Since the ratio of microkernel is directly proportional to damage, the pollution can be assessed through the permillage of microkernel.

通过实验建立起生物学模型，将处于减数分裂时期的韭菜花放入涂有油漆和水性漆的环境中，其花粉细胞常发生突变，而在正常环境中的韭菜花的花粉细胞突变较少。

Before ovulation, primary oocytes complete the first meiosis produce a secondary oocyte and a polar body.

在排卵前，初级卵母细胞完成第1次减数分裂产生次级卵母细胞和第1极体。

Clinical featu res: 18-year-old female, 155 cm high, 45 kg weight, uterus: 22×18 ×17 mm, unclear bilateral ovaries, normal pudendum, breast

A： 中期G带图； B：异常染色体核型分析图； C：家系图； D：减数分裂四分体配对模式图。临床表现：女， 18岁，身高155 cm，体重45 kg，子宫大小22

The phenological phase of reduction division of pollen mother cells and the morphological character of flo-wer buds at reduction division stage were examined.

观察了苹果二倍体品种金帅和国光减数分裂中期Ⅰ染色体配对和构型，提出了进一步研究这一问题的设想。

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。

Chromosome pairing behavior in meiosis of the hybrid F1 was carried out. Results showed that in an average , 1.25 rod bivalents were observed in one PMC, meiotic configuration was 2n=14=11.49Ⅰ+1.25Ⅱ(Xta=1.25) and most of PMCs possessed 1～5 bivalens, indicating that the relatively high homeology was detected between the D genome of Ae.tauschii and the V genome of D.villosum. The morphological differences between F1 hybrids and their parents were significant. F1 plants were highly self-sterile, but partially self-fertile after treated by chromosome doubling technique.

对杂种F1花粉母细胞减数分裂中期Ⅰ染色体配对行为进行观察发现，"节节麦×簇毛麦"杂种F1平均每PMC有1.25个棒状二价体，染色体的平均构型为2n=14=11.49Ⅰ+1.25Ⅱ(Xta=1.25)，大部分被观察的细胞出现1～5个二价体，表明节节麦D染色体与簇毛麦V染色体间具有相对较高的部分同源配对， D和V染色体之间存在一定的部分同源性。F1植株高度自交不育，经染色体加倍处理后能够自交结实。

F1 hybrid has the morphological feature which is between the male and female parents and shoed strong heterosis, exuberant vitality, late ripe period and low rate of self-fertility. The average chromosome configuration of F1 in PMC MI was 18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳ. At anphase Ⅰ in PMC, some laggard chromosomes arranged in equatorial plate. Micronucleus and a lot of abnormal cells can be observed at dyad, tetrad and microspore.

杂种F1形态特征介于双亲之间，具有较强的杂种优势，生长旺盛，熟期晚，自交结实率较低。F1花粉母细胞减数分裂中期Ⅰ平均染色体构型为18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳ，PMC后期Ⅰ观察到部分落后染色体排列在赤道板上；二分体、四分体和小孢子时期，细胞内普遍观察到微核，且出现大量异形细胞。

The most sensitive periodto plant hormones in regulation of floret development are antherlobe formation andmeiosis.

不同发育时期的小花对植物激素的调控效应不一，药隔形成期和减数分裂期是小花对植物激素调控的敏感时期。

They were expressed abundantly in the spermatogonia cells but decreased markedly when the cell grew into the meiotic spermatocyte stage.

它们在睾丸精原细胞中有高表达，但到精母细胞进入减数分裂时则mRNA水平迅速降低。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。