Synchronous and asynchronous chromosome separation was seen, and it was more common that the lagging chromosomes formed anaphase bridges.

有絲分裂過程中染色體的分離同步或不同步久久夜色精品国产欧美一区不卡，不同步分離中的滯后染色體形成后期橋的現(xiàn)象更為普遍。

Chromosome condensation is a significant process of cell multiplication and occurs as a prelude to sister chromatid segregation that initiates at the onset of anaphase.

在細胞增殖過程中老妇女AV，染色質(zhì)集縮是細胞分裂得以正常進行的重要條件性爱一级毛片，也是后期姊妹染色單體分離的序曲。

There are nine bivalents in pollen mother cells at late diplotene or early diakinesis, and the homologous chromosomes essentially arrange on the equatorial plate at late metaphase Ⅰor early anaphase Ⅰ, then the two homologous chromosomes of each bivalent separate from each other and move to two opposite poles drawn by spindle fibers.

在減數(shù)分裂雙線期末或終變期初亚洲欧美日韩视频二区，可以觀察到9個二價體91人妻视频nnnnnn，在中期I末至后期I初，同源染色體基本排列在赤道板上一级裸交有声音A片，然后在紡錘絲的牽引下二價體的兩條同源染色體分開免费观看在线Aⅴ播放，分別移向兩極，每一極有9條染色體超碰在线19，從而確認該屬植物的染色體基數(shù)為x=9国产浮力草草影院入口。

The anther possesses four microsparangia with its wall composed of four layers: epidermis, endothecium, middle layers and a 2\|nucleate celled tapetum.

絨氈層細胞在發(fā)育后期由單核分裂為2 核，多原位解體色aaa，為腺質(zhì)型狼友视频网页；但大約有12％小孢子囊的絨氈層在小孢子四分體釋放時期進入花藥室內(nèi)，成為變形絨氈層亚洲综合在线图片。

The paper probes the characteristics of fissility of the images in his works.

本文即探討其前后期作品中意象的分裂性特征国产高潮流白浆A片免费一区二区。

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.

雜種F1形態(tài)特征介于雙親之間，具有較強的雜種優(yōu)勢黄片vs毛片，生長旺盛亚洲少妇偷拍，熟期晚，自交結(jié)實率較低国产嫖娼妓院视频网站。F1花粉母細胞減數(shù)分裂中期Ⅰ平均染色體構(gòu)型為18.58Ⅰ+18.59Ⅱ+0.085Ⅲ+0.028Ⅳsansansy.com，PMC后期Ⅰ觀察到部分落后染色體排列在赤道板上；二分體亚洲视频二区三区、四分體和小孢子時期国产欧美亚洲一区中文字幕，細胞內(nèi)普遍觀察到微核，且出現(xiàn)大量異形細胞来一个黄色一级大片。

Fertilization results in triploid or tetraploid individuals.

這是由于染色體在第一次減數(shù)分裂的后期沒有分離而導(dǎo)致了多倍的而不是單倍體的配子，受精后產(chǎn)生了三倍或四倍體美女视频韩国一区二区。

Rid of the burden of the schism, the pope now summoned the General Council of 1139, but in no such amiable spirit towards his late adversaries as Calixtus II had shown.

擺脫負擔的分裂国产精品色网站，教宗召見jiujiu精品，現(xiàn)在總理事會1139 ，但在沒有這種平易近人的精神国产欧美在线不卡，對他的后期敵人卡利克斯特斯二所表明的那樣av天堂日韩。

The expression profiles analysis of 25 genes belonging to 8 types in different development periods of Y35 somatic embry showed, genes involved in transcription, signal transduction, cell fate, substance transport, cell and development regulation were active at early and middle stages of somatic embryogenesis, while at the stage of cotyledonary embryo maturation, the high level-expressed genes were mainly those related to storage protein, maturation and defense.

通過半定量和Real-Time PCR技術(shù)，對WRKY和MAPKK等8類25個差異表達基因在Y35體細胞胚不同發(fā)育時期的表達分析顯示国产人人操人人入，轉(zhuǎn)錄久久精品国产清自在天天线、信號轉(zhuǎn)導(dǎo)、細胞生長分裂真人无码免费视频网页、細胞命運琪琪电影网午夜理论片717百度、物質(zhì)轉(zhuǎn)運和多數(shù)發(fā)育調(diào)節(jié)相關(guān)基因在體細胞胚胎發(fā)生的早期或中期比較活躍，而進入子葉胚成熟后期則主要是儲藏蛋白欧美特黄一区二区三区观看在线网站、成熟和防御相關(guān)基因大量表達日韩精品火爆视频在线观看网站。

Fromthese facts,It could be deduced that 8 to 14 pairs of chromosomes possessed a certaindegree of hetorology,which was directly groved to be hybrid origin of P.tomentosaaccording to the good chromosome homology and fertility of P.bolleana and thehybrids of P.tomentosa×P.bolleana,it could be further deduced that the original parentsof P.tomentosa involved probably P.bolleana or P.alba.

從終變期、中期I的染色體構(gòu)型看99草在线视频观看，有數(shù)目不等的聯(lián)會程度較差的單價體和棒狀二價體出現(xiàn)欧插网免费看的视频，在后期I，甚至末期I亦可見到含落后染色體分裂相的細胞国产露出网站，由此推斷可能有8~14對染色體表現(xiàn)出一定程度的異源性成在线人黄页免费视频，鑒于新疆楊以及毛白楊與新疆楊雜交產(chǎn)生的雜種毛新楊的染色體同源性較強、育性較好等現(xiàn)象欧美一级视频网站，進一步推斷毛白楊起源親本可能包括新疆楊或銀白楊亚洲日韩在线视频。