染色体

The QTLs analysis of anther length and ratio of stigma exsertion,two key traits of classification for cultivated rice and common wild rice indicated that there are two QTLs controlling anter length located at the region of C424-G39 of Chromosome 2,and C2289-R1553 of Chromosome 5 and G1149-R1963 of Chromosome 8 respectively.

对控制花药长度和柱头外露率这两个栽培稻和野生稻的重要分类性状的QTL分析结果表明，控制花药长度的2个QTLS分别位于第2染色体C424～G39和第9染色体C2807～C1263间；控制柱头外露率的2个QTLS分别位于第5染色体R2289～R1553间和第8染色体G1149～R1963间。

The result is: out of 187 cases of azoospermia, 77(41.18%)patients with abnormal chromosome(number and structural aberration); heteromorphic chromosome(Y chromosome polymorphisms and pericentric inversion of 9) and 46,XX sex reversal. Out of 30 cases of severe oligospermia, 4 patients with abnormal chromosome(structural aberration and 46,XX sex reversal).

发现187例无精症患者中检出异常核型77例（41.18%）（其中46，XY，t(6；14)(p21；p13)，46，XY，t(8；12)(p21；q24)为世界首报核型），主要涉及染色体异常；染色体异态（Y染色体异态和9号染色体臂间倒位）及46，XX性反转；30例严重少精症患者中检出异常核型4例（13.33%）（结构异常和46，XX性反转）。

With this method the homomorphic chromosome pair No.10 in Bufo bufo gargarizans could be identified as sex-specific chromosomes of the ZZ/ZW-type.The Z chromosomes in all male animals replicated synchronously,but Z chromosome and W chromosome of females revealed heteromorphic replication pattern.

用这种方法我们鉴定中华大蟾蜍蜍第10对同型染色体为ZZ/ZW型性染色体，所有雄性动物两个Z染色体的复制型是完全相同的，而雌性动物的Z和W染色体显示出异型复制型。

It was also found that the chromosomes paired well and formed a rod heteromorphic bivalent in the hybrid F1[73(36)9-1×CSDT 1BL]. Whereas 73(36)9-1 produced mainly configuration of 20''+1'+t' when test-crossed with CSDT 1BS. It showed that the translocation occurred on chromosome 1B short arm, and this segment came from rye chromosome 1RL. In the present paper we discussed also the way in which the translocation might be caused, and concluded that it was formed through reunion of two kind telocentrica (1BL and 1RL) after simultaneous misdivision of two univalent chromosomes (a wheat chromosome 1B, and a rye 1R).

同时还发现，73（36）9-1和"中国春"双端体的1BL能很好地配对并形成一个棒状的异形二价体，而它和CSDT 1BS的染色体则主要产生20+1′+t′的构型，从而证明易位发生的可能途径，推断是由于在F1花粉母细胞中的两个单价体（一个是小麦染色体1B，一个是黑麦染色体1R）同时进行错分裂之后产生的两种端着丝点染色体（1BL和1RL）重新并合形成的，因而冬小麦73（36）9-1可能是一个自发产生的易位系。

Finally, chromosome behavior of hybrids between Brassica hexaploid andO.violaceus was different from that of hybrids between diploid or tetraploid andO.violaceus.

而B基因组染色体、较多的A基因组染色体、部分的C基因组及少量的诸葛菜染色体分到了同一极，但诸葛菜染色体在随后的细胞分裂过程中被消除。

Fig 1 Negative control Female umbilical cord sample has no Y-specific signal after in situ hybridization with the biotinylated Y-repeated sequence DNA probe PY3.4 Fig 2 Positive control Flow-sorted male umbilical cord cells hybridized to Y-specific DNA probe PY3.4,Every cell contains a Y-specific signal Fig 3 Fetal cells sorted from maternal blood Flow-sorted cells from a pregnant woman at 20 weeks of gestation hybridized to Y-specific DNA probe PY3.4,containing a Y-specific signal Fig 4 The result of polymerase chain reaction Lane 1:male umbilical cord NRBCs sorted by FITC-conjugated anti-monoclonal glycophorin A;Lane 2:sample of 2;Lane 3:male umbilical cord NRBCs sorted by FITC-conjugated anti-CD36;Lanes 4-5:samples of 1 and 3;Lane 6:50 cells of male;Lane 7:5 cells of male;Lane 8:200ng male DNA(positive+control);Lane 9:nonpregnant female DNA(negative+control);Lane 10:ΦX174 HaeⅢ Maker,271bp:amplified band of Y-specific gene SRY;383bp:amplified band of human β-globin gene

图1 阴性对照女性脐带血标本，经与生物素标记的Y-染色体重复序列DNA探针原位杂交后未见Y-染色体特异信号图2 阳性对照分选的男性脐血细胞经与Y-特异DNA探针杂交后，每一细胞都含有Y-染色体特异信号图3 母体外周血中分选的胎儿细胞从一位妊娠20周的孕妇外周血中分选出的细胞经与Y-特异DNA探针杂交细胞中含有Y-染色体特异信号图4 聚合酶链反应结果 1：GPA-FITC单抗分选男胎脐血NRBCs；2：2号标本；3：CD36-FITC单抗分选男胎脐血NRBCs；4、5：1、3号标本；6：50个男性细胞标本；7：5个男性细胞标本；8：200ng男性DNA；9：未孕女性DNA；10：ΦX174 HaeⅢ标准，271bp：为SRY基因扩增带；383bp：为人β-珠蛋白基因扩增带内参照

Results of chromosomic analysis showed that the chromosome of Beijing Fatty Chicken, Langshan Chicken and Small-tailed Han Sheep were mainly diploid and the individuals of diploid occupied 87.1%, 86.7%, 93.4% in population observed respectively. The chromosomic structure mutation was 1.5%, 0.8%, 1.4% respectively that different from chromosomic morpHology results reported by other researchers.

染色体分析结果表明，北京油鸡、狼山鸡、小尾寒羊成纤维细胞均以二倍体为主，二倍体染色体数目分别占所观察数目的87.1％、86.7％和93.4％；染色体结构变异率分别为1.5％、0.8％和1.4％；染色体形态与前人报道的其他品种相比略有不同。

This experiment works on:1.prepare marrow cell chromosome samples;2.take pictures of chromosome in karyon by lens-check;3.Measure the length of chromosome short arm and long arm,calculate the relative length of frog chromosome and the arm index and the position of centromere,with the leven method of outside-body karyon pattern analysis.

本实验制备了骨髓细胞的染色体标本，并且通过镜检拍下一个细胞核中染色体的照片，用leven方法进行体外核型分析，测量每条染色体的长臂长与短臂长，并计算出青蛙染色体的相对长度，臂指数和着丝粒。

In pachytene the paired homologous chromosomes contract. At this point each chromosome consists of a pair of chromatids and the two associated chromosomes are termed a tetrad.

在粗线期，配对的同源染色体缩短，这时每条染色体包括2个联合的染色体，每个染色体包括1对染色单体，即四分体。

The authors proposed that heterochromatin change in genome might play an important role in balancing the germplasms between maize and its distant relatve after cross and parthenocarpy.

这种变异不仅存在于表型不稳定的早代孤雌系中，而且还存在于表型稳定的高代系中，造成这种变异的原因可能是因为远缘种质的引入影响到遗传平衡进而引起染色体发生结构重排并引起染色质的变化，这种变化与玉米染色体组中非同源染色体间存在的同源片段和因此造成的减数分裂过程中非同源染色体配对有着直接的关系。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

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如果有任何问题，你可以随时联系我。