Results showed that the PMC meiosis of autotetraploid was similar to the diploid except some particularities. In metaphase Ⅰ, multivalent, quadrivalent, trivalent, bivalent and univalent were observed and some of the chromosomes were found not to rank on the metaphase plate and so did in metaphase Ⅱ cells. In anaphase Ⅰ and anaphase Ⅱ cells, there were lagging chromosomes, chromosome bridge and fragment. During anaphase Ⅱ and telophase Ⅱ, chromosome segregation was not synchronous or equal. At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared.

結(jié)果表明夜综合日韩中文字幕，同源四倍體花粉母細胞減數(shù)分裂過程與二倍體相比，中期Ⅰ染色體構(gòu)型復(fù)雜小黄片久久不，有多價體久久最新视频、四價體、三價體18禁黄网站禁片、二價體和單價體人人干在线视频；中期Ⅰ及中期Ⅱ有部分染色體沒有排列在赤道板上；后期Ⅰ及后期Ⅱ出現(xiàn)落后染色體一级免费黄色视频一级免费黄色视频、染色體橋及斷片日本群交视频；后期Ⅱ和末期Ⅱ有染色體不同步分離及不等分裂的現(xiàn)象；四分體時期還出現(xiàn)二分體国产清纯白嫩大学生正在播放、三分體黄片免费直接看的色色小视频、含微核的異常四分體及多分體。

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)特征介于雙親之間操操网，具有較強的雜種優(yōu)勢www.污污网站，生長旺盛，熟期晚一级毛片免费视频观看无码，自交結(jié)實率較低国内私密经典盗摄AV。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+0.028Ⅳ，PMC后期Ⅰ觀察到部分落后染色體排列在赤道板上；二分體日皮视频免费、四分體和小孢子時期秋霞电影网手机版，細胞內(nèi)普遍觀察到微核，且出現(xiàn)大量異形細胞欧美激情高潮喷水喷水。