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The results indicated that not only diploid pure lines but also aneuploids were produced by this method.

这一结果表明,用这种方法不仅能获得二倍体纯系,而且还可以获得非整倍休。

They are often morphologically distinct from A chromosomes, being smallerand more highly heterochromatic in most cases. B chromosomes do not pair with Achromosomes, and they are inherited in a non-Mendelian way, exhibiting meiotic andmitotic instability and nondisjunction. However, B chromosome DNA is quiteidentical to the corresponding sequence on the A chromosome complement. So far afew B chromosome specific DNA sequence have been identified. Specific DNAsequences on B chromosome have been the attractive research area on Bchromosomes.

现已在千余种植物和近三百种动物中被发现。B染色体与物种中正常染色体不同:独立于整倍体基因组之外,减数分裂时不与A染色体发生联会和配对,细胞分裂后期不分离,非孟德尔遗传,富含异染色质,不含对宿主主要性状有影响的基因等。B染色体DNA的分子组成既与A染色体极为相似,具有A染色体DNA分子组成的一般特征:富含重复序列和转座成分,染色体三大功能组件DNA高度同源;又与之相区别,含有B染色体特异的DNA序列,这些DNA序列可以为探讨B染色体的起源和进化提供有价值的信息。

The phenomenon of polyploidy and aneuploidy exists in the Genus, in which there are polyploid complex.

对19个分类群作了核型观察,其中16个分类群作了组型分析,结果表明各分类群间核型差异显著,该属普遍存在着多倍性和非整倍性现象,并有多倍体复合体类群存在。

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Do you know, i need you to come back

你知道吗,我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书,王祥生,李德昌。安徽省首次发现嗜群血蜱。

Chapter Three: Type classification of DE structure in Sino-Tibetan languages.

第三章汉藏语&的&字结构的类型划分。