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异染色体

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GISH technique was applied to TAF46 a partial amphiploid (2n=8x=56) derived from a Thinopyrum intermedium×Triticum aestivum hybrid and to 6 of the possible disomic addition line derived from it to determine the genome origin of the alien genome and the addition lines.

应用GISH对小偃麦部分双二倍体TAF46(2n=8x=56)及其衍生的6个二体异附加系的中间偃麦草染色体组种类进行了分析、鉴定。

The number of nuclei in synchronous blastoderm is much fewer than that in wild type group, and the distribution of nuclei was uneven, which indicates that the nuclear division in mutated early embryos was asynchronous and maybe some nuclei undergoes degeneration.

推测HIRA可能影响了染色体的结构和组装,从而影响了细胞周期的进程,导致果蝇早期胚胎细胞核分裂异不正常。

The results indicated that chromosome counting was the most reliable and precise method, however, it was cumbersome and required skilled cytological techniques; The chromocenter size, heterochromatin number, chroloplast number of guard cell and certain plant morphological characteristics are simple and practical methods for ploidydetermination but with some shortages.

结果表明:对体细胞染色体的直接计数法是最可靠的方法,但费时、难度大;叶片气孔大小与倍性无显著相关性;保卫细胞叶绿体数目、体细胞染色中心大小以及异染色质个数与黄瓜倍性密切相关,是简单、快速而有效的倍性鉴定方法;植株的形态学观察也能间接确定植株倍性,但鉴定时期偏晚,精确性较差。

Chromatin hetropycnote partly in spermatogonium, then become highly coacervate to form chromosome at the stage of spermatid and at last decondense at the stage of spermatozoon.

染色质在精原细胞中为部分异固缩,在精母细胞中高度凝聚为染色体,在精细胞及精子中为均匀非致密态。

According to the difference of homologous chromosomed, we can easily judge it is a cross-pollination plants.

依照不同的同源染色体我们能够很容易的判定这是一种异花授粉植物。

The types of histone methyltransferases, the relationship between methylation of Lysine 9 of H3 and the formation of heterochromatin, gene regulation in euchromatin, and that with DNA methylation, were mainly introduced.

主要阐述了组蛋白甲基转移酶的类型,组蛋白H3中第9位赖氨酸甲基化与异染色质的形成、常染色体中基因表达的调控,以及与DNA甲基化之间的关系,说明了组蛋白甲基化与组蛋白乙酰化、磷酸化的相互关系,指出组蛋白甲基化对维持细胞各种状态的平衡起到极其重要的作用。

Each of these bundles is called a nucleosome, and many nucleosomes are bound together by the continuing strand of DNA, which forms a string of beads that further coils to form one of two kinds of chromatin, either euchromatin or heterochromatin.

所有细胞核的最显著的特点就是染色体,由DNA和组蛋白所组成的染色质构成,DNA绕行在由4个相似的组蛋白分子结合而形成的柱状的芯上,这一结构称为核小体,核小体之间由连续的DNA链连接,形成串珠样结构,进一步盘曲形成常染色质或异染色质。

In a few addition lines,the gliadin genes carried by ...

在个别异附加系中,冰草染色体上的醇溶蛋白基因能够直接表达;而在多数情况下,它们仅能干扰或改变少数几个醇溶蛋白组分的合成,包括诱发、增强和抑制小麦原有醇溶蛋白基因的表达。

So we concluded that the heterochromatin of X and Y was homologous.

由此我们可以确认,X、Y染色体的异染色质是同源的。

Thus, the meiotic chromosome cofigurations showed that the tetraploids and hexaploids in C.reticulata allopolyploids, and the appearance of a few tetravalents in some populations might indicatehomology of chromosomes in different genomes to some extent.

根据减数分裂的构型,我们认为,四倍体和六倍体分别为异源四倍体和异源六倍体,少数四价体的存在表明染色体有部分同源性。

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