染色体组的

Interestingly, a monopolar spindle was assembled in each blastomere in the second cell cycle, and disjunction of duplicated chromosomes and the cleaage was preented, leading to the chromosome set doubling.

有趣的是，在第二个细胞周期中，每一个分裂球中都组装了一个单极纺锤体，同源染色体分离和卵裂被阻止，导致染色体组加倍。

Some problems related to "variation of chromosome number" in some teaching materials of genetics are presented in this article.

指出了高校有关遗传学教材"染色体数目变异"一节中，部分概念如单倍体、染色体组、非整倍体等存在的概念表述不清、前后矛盾等问题，并提出了相应的修改意见。

The applications of chromosome numbers and basic numbers in pteridophyte systematics are reviewed in detail. The significance of karyotype analysis, polyploidy, pogamy, and reticulate evolution in pteridophytic classification, evolution, and phytogeography is also reviewed.

文中论述了蕨类植物染色体数目和染色体基数在系统学上的应用以及蕨类植物染色体组型分析、多倍化、无融合生殖、多倍体复合体及网状进化的研究概况。

In all 6 species, 5S rDNA was located at the paracentromeric region of a pair of middle-sized telocentric chromosome.

结果表明5S rDNA在6种石斑鱼染色体组中，均位于1对中等大小端部着丝粒染色体且靠近着丝点的位置上，种间和种内未观察到差异，在染色体上的分布模式基本一致。

Objective :For the first time,the Karyotype and the meiosis chromosome of Testudo impressa are reported in the research.

目的：研究凹甲陆龟Testudo impressa的染色体组型及减数分裂染色体。

Long stretches of the continuous DNA molecule wind around these clusters of proteins, or histones, forming beadlike complexes known

这些螺旋和超螺旋形成致密的染色体组结构。每个长链DNA与组蛋白和非组蛋白一起构成染色质物质。

C-banding analysis of satellites in 9 accessions of Ae.tauschii native to China was carried out with C-banded miotic interphases,prophases and metaphases,The results showed that the c-banded heterochromatin of satellites of Ae.tauschii did not change in size during the whole miotic stage and novariaton was observed among plants and cells within a accession,while polymorphism in c-banded satellites between different accessions was found.

5D染色体是节节麦整个染色体组中唯一的1对随体染色体，其随体位于5D短臂的末端。对来源于中国的9个不同的节节麦居群的吉姆萨C带分析表明：同一份节节麦居群内不同植株或不同细胞，这个端部随体在整个有丝分裂前期、中期和间期都很稳定，表现为大小、强弱一致的端部特征带。

The karyotype and banding patterns of the Songliao Black Pig were studied by method of peripheral blood ly-mphocytes culture and the techniques of G-,C-banding.The relative length,centromere index and arm ratio of each indi-vidual chromosome were analyzed.

采用外周血淋巴细胞培养方法以及C-显带和G-显带技术，对松辽黑猪进行了染色体组型分析及显带研究，并分析了各号染色体的相对长度、着丝点指数及臂比。

RESULTS: The rates of germinal vesicle breakdown were 98%, 22.2%, 40.1% and the rates of the first polar body (PB1) extrusion were 77.7%, 15.5%, 27.6% for M16, Hx and FA groups, respectively. The rates of GVBD and PB1 were all increased with the addition of FA compared with the Hx groups and comparison was significant (P.05). Hx and FA did not influence chromosome, but FA reversed the size of metaphase spindle elongated by Hx.

结果：M16培养液组、Hx模型组和FA处理组的GVBD率分别为98%、22.2%、40.1%，其PB1排出率分别为77.7%、15.5%、27.6%，各组间的差异均具有统计学意义(P.05)；次黄嘌呤和叶酸对染色体的形态没有影响，而次黄嘌呤使正常的纺锤体变长、变宽、面积变大，FA组较Hx模型组增大的纺锤体有所恢复，并接近于正常水平。

Once its detected—and even then, that is only visually—the animal is on death row.

目前，研究人员正在分析这种疾病的染色体结构，并已识别出它的染色体组型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。