染色体

The results showed as follows: The diploid chromosome number of Yanbian yellow cattle and Liyan hybrid cattle were 2n=60,the karyotype of bulls was 2n=60,XY,while cows were 2n=60,XX. 29 pairs of autosomes were telocentric.

采用外周血淋巴细胞培养技术、常规染色体制片技术和染色体C-分带技术，对延边黄牛(10♀，10♂)和利延杂交牛(14♀，15♂)两品种的染色体核型和C-带进行了研究。

Besides, NO.4, 6, 8, Z chromosome of domestic fowl were submetacentric, submetacentric, metacentric, metacentric, repectively, whereas those of quail were all telocentric.

结果表明，家鸡和鹌鹑染色体数目均为2n=78，但染色体的形态存在明显差异，主要表现在NO.1、NO.4、NO.6、NO.8和Z染色体上。

Through chromosome identification, the chromosome numbers of diploid and tetraploid were 16 and 32, respectirely.

染色体鉴定表明，二倍体染色体数为2n=2x=16，四倍体染色体数为2n=4x=32。

The result showed that the plant of Maicao No. 9 was tall, with good fecundity, fully filled grain and vigorous growth. The chromosome number of the root cells was 2n=56, through the observation of pollen mother cells meiosis, there were a certain amount of univalents, ring bivalents and bar bivalents in PMCM. Different numbers of lagging chromosomes, chromosome bridges and micronucleus were found in anaphaseⅠ, anaphaseⅡ and tetraspore.

结果表明：麦草9号植株高大，结实性较好，籽粒饱满，生长旺盛；根尖细胞染色体数目为2n=56，对其进行花粉母细胞减数分裂观察，中期Ⅰ具有一定数量的单价体、环状二价体、棒状二价体；后期Ⅰ、后期Ⅱ与四分体时期都出现不同数量的落后染色体、染色体桥、微核等现象。

Abnormal chromosome was detected in 17 fetuses. Among them, trisome 21, trisome 18, trisome 13, Turner syndrome, Klinefelter syndrome, short arm deletion of chromosome 18, and inverted chromosome 9 were detected in 8, 3, 1, 1, 1, and 2 fetuses, respectively. Abnormal chromosome was found in 5 out of 8 fetuses who received serum screening. Ultrasound showed abnormal chromosome in 11 fetuses.

共诊断17例胎儿染色体异常，其中21三体8例，18三体3例，13三体1例， 1 Turner综合征1例，Klinefelter综合征1例， 18染色体短臂微缺失1例，9号染色体臂间倒位2例(1例来源于母亲)。17例中有8例进行了唐氏儿血清学筛查，5例异常，11例超声检查胎儿有结构异常。

Unlabled human genomic DNA was used to inhibit the hybridization of sequences in the library that bind to mutiple chromosomes. Structure abnormality was detected clearly in metaphase. Combined with the banding c...

染色体涂染技术是染色体显带技术的重要补充和发展，为染色体结构异常提供了一种直观、准确的检测手段，在遗传咨询和产前诊断方面有重要作用。

If it consists of one X chromosome and one Y chromosome, it will be a male.

动物的性徵决定於两种性染色体，一是「X染色体」，一是「Y染色体」。

While a male cell has an X chromosome from the mother and Y chromosome from the father.

而男子的细胞有一个X染色体来自母亲，一个Y染色体来自父亲，而Y染色体仅决定性别。

The frequency of cells with univalent at MI and with lagging chromosomes and chromosomal bridge at A I in PMC of F1 hybrids of 4 alloplasmic 1BL:/1RS and non-1BL/1RS wheat male sterile lines with Aegilops kotschyi,Ae. variabilis,Ae.ventricosa and Ae.bicornis cytoplasms were systematically investigated,and the relationship between FCU at M I,FCLB at A I and F1 selfed seed set was analyzed.

系统调查了4类异质(粘果、易变、偏凸、二角山羊草细胞质)1BL/lRS、非1BL/1RS小麦雄性不育系与其恢复系杂种F减数分裂中期Ⅰ出现单价体细胞频率，以及后期Ⅰ出现落后染色体和染色体桥细胞频率，并对中、后期染色体变异率与杂种F自交结实率进行了相关分析。

There are several characters in our researches:(1) we study the relationship between karyotype polymorphism and sex chromosome in Elaphodus Cephalophus which only lives in China, and explore the mechanism of its sex chromosome evolution.

研究特色主要体现在：一、以我国特有的动物毛冠鹿为材料，在染色体和DNA水平上研究毛冠鹿核型多态与性染色体关系，探索毛冠鹿性染色体发生和演变的机制。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐