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1.
王秀珍  王佑举 《蛛形学报》1996,5(2):137-140
报告迷宫漏斗蛛的染色体数目,形态结构和性染色体组成,结果表明,迷宫漏斗蛛体细胞染色体数目是:雄性2n=42,雌性2n=44,性别决定机制属X1X2O型,X染色体是全部染色体中最长的和最短的2个(对),染色体似乎均为端或亚端着丝粒染色体,这由C-显带标本分析所证实,没有亚中着丝粒染色体的证据,C-带标本分析表明,常染色体中,各条染色全的C-带纹,其大小和染色深浅无明显差异,但X2染色体上有明显宽的C  相似文献   

2.
报道了温室希蛛的染色体数目、形态结构和性染色体组成。从目前的结果可见,温室希蛛的染色体数目是:雄性体细胞染色体数为2n=22,雌性为2n=24。其性决定机制属于X_1X_2O型。所有染色体似乎均为端或亚端着丝粒染色体,这个结论被对其C-带标本的分析所证实。两个(对)X-染色体是最短的和次最短的,温室希蛛染色体C-带标本的分析没有观察到染色体间有明显的结构差异。在染色体G-带标本中,获得了稳定的带纹。  相似文献   

3.
星豹蛛Pardosa astigera染色体组型分析   总被引:2,自引:0,他引:2  
首次报告星豹蛛的染色体形态结构、数目和性染色体组成。实验结果表明:星豹蛛染色体数目为:雄体2n=28,雌体2n=30,性别决定机制属于X_1X_2O型。X_1为全部染色体中最长的,X_2为全部染色体中最短的。全部染色体均为端着丝粒,这个结论可以被C-带标本所证实,且C-带带纹大小及染色深浅均无明显差异。G-带处理得到了稳定的、有重复性的带纹。  相似文献   

4.
家隅蛛的染色体(蜘蛛目:漏斗蛛科)   总被引:3,自引:0,他引:3  
王秀珍  梁宁 《蛛形学报》1996,5(2):141-144
报告家隅蛛的染色体数目、形态结构和性染色体组成。实验结果表明:家隅蛛的染色体数目是:雄性体细胞为43,雌体为46。性别决定机制是X_1X_2X_3O型。3个(对)X染色体是全部染色体中最小的和次最小的。所有染色体几乎都是端或亚端着丝粒染色体,这一结论被对其C-显带标本的分析所证实。6~#~14~#染色体长臂末端有明显的结构异染色质。G-显带标本中,获得了清晰的带纹。  相似文献   

5.
底栖类球蛛的核型分析(蜘蛛目:类球蛛科)   总被引:2,自引:0,他引:2  
第1次报道底栖类球蛛的核型分析,包括染色体数目、形态结构和性染色体组成。实验结果表明底栖类球蛛的染色体数目是:雄性体细胞染色体数为2n=22,雌性体细胞为2n=24,性决定机制为X_1X_2O系统,X染色体为最小的和次最小的,5~#染色体为随体染色体;对C-标本分析表明,染色体均为端或亚端着丝粒染色体,各染色体C-带带纹有识别特点。  相似文献   

6.
类水狼蛛的核型(蜘蛛目:狼蛛科)   总被引:3,自引:0,他引:3  
对稻田优势种类类水狼蛛(Pirata piratoides)进行了染色体核型、C-带核型的观察与分析,结果:类水狼蛛染色体数目:雄性2n=26,雌性2n=28,性别决定机制为X_1X_2O型,所有染色体均为端着丝粒,性染色体为最长的1条(对)和最短的1条(对)。  相似文献   

7.
机敏漏斗蛛染色体初步研究   总被引:4,自引:0,他引:4  
王虹  任本命 《蛛形学报》1992,1(1):42-44
本文对机敏漏斗蛛Agelena difficlis Fox,1936的染色体进行了初步研究,发现其染色体数目为2n=44.19对染色体为近中部着丝粒染色体和中部着丝粒染色体,2对为端部着丝粒染色体,1对为性染色体,雄性为XY,雌性为XX。  相似文献   

8.
报道四斑巨螯蛛的染色体数目,形态特征和性染色体组成,结果表明:四斑巨螯蛛的染色体数目是:雌性2n=26;雄性2n=24,性别决定机制是X_1X_2O型,这种蜘蛛的染色体小,常规制片显示出自然带纹。  相似文献   

9.
奇异球蛛的核型分析(蜘蛛目:球蛛科)   总被引:2,自引:0,他引:2  
第1次报道奇异球蛛的核型,包括染色体数目、形态结构、性染色体组成。实验结果表明奇异球蛛染色体数目是:雄体细胞为2n=21,雌体细胞2n=22,性决定机制为XO系统,X染色体为最短的1个(对)。对C-带标本分析表明:所有染色体均为端或亚端丝粒,各染色体有其识别特点。  相似文献   

10.
温室希蛛染色体的观察(蜘蛛目:珠蛛科)   总被引:1,自引:0,他引:1  
报道了温室希蛛的染色体数目,形态结构和性染色体组成,从目前的结果可见,温室希蛛的染色体数目是,雄性体细胞染色体数为2n=22,雌性为2n=24其性决定机制属于X1X2O型,所有染色体似乎均为端或亚端着丝粒染色体,这个结论被其对C-带标本的分析所证实,两个(对)X-染色体是最短的和次最短的,温室希蛛染色体C-带标本的分析没有观察到染色体间有明显的结构差异,在染色体G-带标本中,获得了稳定的带纹。  相似文献   

11.
It is known that up to 50% spontaneous abortions (SA) in the first trimester of pregnancy are associated with chromosomal abnormalities. We studied mosaic forms of chromosomal abnormalities in 650 SA specimens using interphase MFISH and DNA probes for chromosomes 1, 9, 13/21, 14/22, 15, 16, 18, X, and Y. Numerical chromosomal abnormalities were discovered in 58.2% (378 cases). They contained combined chromosomal abnormalities (aneuploidy of several chromosomes or aneuploidy in combination with polyploidy in the same specimen) in 7.7% (29 cases) or 4.5% of the entire SA sample; autosomal trisomy, in 45% (18.2% in chromosome 16, 8.9% in chromosomes 14/22, 7.9% in chromosomes 13/21, 3.1% in chromosome 18, and 1.4% in chromosome 9). Chromosome X aneuploidy was found in 27% cases, among which 9.6% represented chromosome X monosomy. Polyploidy was observed in 22.9% cases. In 5.1% cases, we observed mosaic form of autosomal monosomy. Among the SA cases with chromosomal abnormalities mosaicism was observed in 50.3% (∼ 25% of the entire SA sample). The results of the present study indicate that significant amount of chromosomal abnormalities in SA cells are associated with disturbances in mitotic chromosome separation, which represents the most common cause of intrauterine fetal death. It was also shown that original collection of DNA probes and the technique of interphase MFISH could be useful for detection of chromosomal mosaicism in prenatal cell specimens.  相似文献   

12.
13.
In sciarids, all zygotes start development with the 3X;2A chromosome constitution, two of the three X chromosomes being of paternal origin. The elimination of either one or two paternal X chromosomes produces the X:A signal which determines development along the female (2X;2A) or male (X0;2A) pathway, respectively. A model is proposed in which a chromosomal factor (CF) positively interacts with the X chromosome(s) causing its/their elimination. The number of X chromosomes to be eliminated is controlled by a maternal factor (MF) which regulates the amount of free CF factor interacting with the X chromosomes. Imprinting refers to the inability of maternal X chromosomes to bind CF factor. Copyright 1999 Academic Press.  相似文献   

14.
Sen Pathak  A. Dean Stock 《Genetics》1974,78(2):703-714
A comparison of the Giemsa-banding patterns of the X chromosomes in various mammalian species including man indicates that two major bands (A and B), which are resistant to trypsin and urea-treatments, are always present irrespective of the gross morphology of the X chromosomes. This is true in all mammalian species with the "original or standard type" X chromosomes (5-6% of the haploid genome) thus far analyzed. In the unusually large-sized X chromosomes the extra chromosomal material may be due either to the addition of genetically inert constitutive heterochromatin or to an X-autosome translocation. In these X chromosomes two major bands are present in the actual X-chromosome segment. Our data on C and G band patterns also support Ohno's hypothesis that the mammalian X chromosome is extremely conservative in its genetic content, in spite of its cytogenetic variability.  相似文献   

15.
A bovine/murine hybrid cell panel consisting of 57 cell lines was typed with 124 markers by PCR, Southern hybridisation and isozyme analysis in order to establish its utility as a resource for genome mapping. All bovine chromosomes, including the sex chromosomes were represented in the panel. Computerised analysis of syntenies indicated that there are no cell lines containing only a single bovine chromosome. The panel was used to map 10 new bovine microsatellite markers, and the MYL6 and CPE genes. This panel is informative for all bovine chromosomes other than the sex-specific region of the X chromosome and can be used in synteny mapping studies. At present, due to the relatively small number of markers typed, the resolution of the panel does not go beyond the chromosomal level.  相似文献   

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