着丝粒

The number of the chromosomes in Henan large tail sheep is 2n=54, the karyotypes of male and female sheep are 54, XY and 54, XX, respectively. There are 26 pairs of autosomes and 1 pair of sex-chromosome. Among 26 pairs of autosomes, 3 pairs are metacentric chromosomes, 23 pairs are telocentric chromosomes. X chromosome is the biggest subtelocentric chromosome and Y chromosome is the smallest submetacentric chromosome.

河南大尾寒羊二倍体染色体数目为2n=54，公羊核型54，XY；母羊核型54，XX.27对染色体中包括26对常染色体和1对性染色体，常染色体中有3对为中着丝粒染色体，23对为端着丝粒染色体；性染色体中，X染色体为最大的端着丝粒染色体，Y染色体为最小的中着丝粒染色体。

In P. dabryanus, the PdSox8 and PdSox9 were successfully localized in the No.4 and No.2 telocentric chromosome respectively, the relative distance to centromere is 40.2% and 67.5%; In M. anguillicaudatus, they were localized in the No.9 and No.6 telocentric chromosome respectively, the relative distance to centromere is 58.3% and 30.8%.

结果表明，在大鳞副泥鳅中PdSox8和PdSox9分别位于端部着丝粒染色体第4和第2 号即t4和t2染色体上，信号位点距着丝粒的相对距离分别为40.2%和67.5%；在泥鳅中，则分别位于t9和t6上，信息位点距着丝粒的相对距离分别为58.3%和30.8%。

The data show that:(1) The chromosome number of Andrias davidianus is 2n=60.(2) The karyotype consists of macrochromosomes and microchromosomes.(3) In macrochromosomes, eight pairs are metacentric and two pairs are submetacentric.(4) Andrias davidianus has 20 pairs of microchromosomes, among which are four pairs of bi-armed chromosomes. They are No.11, No.25, No.23 and No.24. Other microchromosomes are telecentric.

结果表明：(1)中国大鲵染色体数目为2n=60；(2)染色体由大染色体和微小染色体组成，属于两型性染色体；(3)大染色体中有8对中部着丝粒染色体和2对亚中部着丝粒染色体；(4)微小染色体有20对，大多是端部着丝粒染色体，在雌性中发现了4对双臂染色体，第11、25号是亚中部着丝粒染色体，第23、24号是中部着丝粒染色体。

Effect of Different Sowing Date and Densities to the Yield of Avena nuda L .Variety Huazao No.2;2. The paper analyses the chromosome karyotype of Avena nuda L .

对莜麦染色体的核型进行了分析，结果表明其染色体数为42，为六倍体，包括11对中部着丝粒染色体，9对近中部着丝粒染色体和1对近端着丝粒染色体，其中有3对染色体带有随体。

Thirty six homologous pairs of chromosomes were autosomes , in which chromosomes ,pairs of 1 to 20 were acrocentric-subterminal , 21 to 36 metacentric-submetacentric . And X chromosome was metacentric, Y chromosome terminal.

其中，1～20对常染色体为亚端着丝粒染色体，21～36对常染色体为亚中着丝粒染色体和中着丝粒染色体，X为中着丝粒染色体，Y为端着丝粒染色体。

There are three types of Y chromosomes for yellow cattle landraces in China, that is, metacentric Y chromosomes, submetacentric Y chromosomes, and acrocentric Y chromosomes, which illustrates the origin of yellow cattle landraces in China from Bos taurus and Bos indicus.

中国地方黄牛Y染色体具有中着丝粒、亚中着丝粒和近端着丝粒3种类型，这说明中国地方黄牛起源于普通牛和瘤牛。

6 The caryotype of giant panda's fibroblasts can be divided into two groups based on centromericindex.Group one of No.l-17 and X chromosomes is metacentric or submetacentric;Group two ofNo.18-20 is acrocentric little chromosomes.

第四代大熊猫皮肤成纤维细胞(PF4)染色体组型：2n＝42，根据着丝粒指数，总体可将其分为两种类型，1-17号常染色体和X染色体为中部或亚中着丝粒，18-20号常染色体为小型近端着丝粒。

There appeared prominent signals on pericentric regions of all the other chromosomes besides chromosome 4. The signals were strong on most of the chromosomes and weak only on one chromosome pair.

这一克隆除在第4染色体近着丝粒区显示明显的信号外，其它染色体的近着丝粒区同样具有信号，多数染色体为强信号，仅1对染色体信号较弱，还有3对染色体具有像着丝粒两侧异染色质块(pericentric heterochromatin block)的信号，中间有一个缢痕。

Thirty six homologous Pairs of chromosomes were autosomes, in which chromosomes, Pairs of 1 to 8 were metacentric.9 to 36 . And X was metacetric, Y chromosome terminal.

其中，1—8对常染色体为中间着丝粒染色体，9-36对常染色体为端部着丝粒染色体，X为中着丝粒染色体，Y为最小的为端部着丝粒染色体。

Chromosome number in all counted complete metaphases of Carassius auratus var. Dongtingking is 48. Analysis of chromosome can be divided into four sections according to the position of the centromere.

核型分析结果表明，翘嘴鲌的肾细胞染色体组是由48条染色体组成，染色体组型按着丝粒位置可分为四组，分别是中部着丝粒染色体、亚中部着丝粒染色体、端部着丝粒染色体。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。