夏牙鲆(♂)与牙鲆(♀)人工杂交的细胞遗传学初步研究   总被引：6，自引：0，他引：6  

尤锋  徐世宏  许建和  徐冬冬  马道远  张培军  李军 《海洋科学》2006,30(3):51-55

于2004年11～12月在青岛薛家岛养鱼场采用夏牙鲆(Paralichthysdentatus)的精子与牙鲆(Paralichthysolivaceus)的卵子实施了多次人工杂交实验,并进行了父本母本鱼类个体、子代的染色体制片观察和细胞中DNA相对含量的流式细胞仪检测。结果表明,夏牙鲆染色体数为48,核型为2n=48t、臂数NF=48;子代的染色体数和核型与父母本的一样,也为2n=48t;子代的细胞中DNA的相对含量也表明其为二倍体。因此,可以明确其为杂交的后代,而不是雌核发育。  相似文献   

Chromosomal population structuring in carangids (Perciformes) between the north-eastern and south-eastern coasts of Brazil     

《African Journal of Marine Science》2013,35(3):383-389

The family Carangidae comprises 151 species, of which only 19 have been so far karyotyped, including a few representatives from the Western Atlantic Ocean. This study compared the cytogenetic features of three Atlantic carangids, Chloroscombrus chrysurus, Trachinotus goodei and T. falcatus, from north-eastern Brazilian coast, with previously obtained cytogenetic data from southern populations. All species presented 2n = 48 chromosomes. Chloroscombrus chrysurus showed a conserved karyotypic macrostructure (2n = 48a, FN = 48) whereas T. goodei (2m + 2sm + 44a; FN = 52) and T. falcatus (2n = 10m/sm + 38a; FN = 58) presented more diversified karyotypes. Data showed that the samples of C. chrysurus from the north-eastern and south-eastern regions did not differ cytogenetically. However, the frequency or position of ribosomal sites (Ag-NOR/18S rDNA) were effective in discriminating the populations of Trachinotus between these coastal regions. The distinct chromosomal patterns suggest a historical genetic fractionating of the Trachinotus populations along the Brazilian coast.  相似文献   

紫菜的细胞遗传学研究现状及展望   总被引：2，自引：2，他引：0  

戴继勋  沈颂东 《中国海洋大学学报(自然科学版)》1999,(4)

综述了紫菜属的染色体数目、形态、ＤＮＡ 含量和减数分裂的发生等细胞遗传学研究的概况。７０ 多种紫菜已有５４ 种做了染色体计数,紫菜属染色体的一个显著特征是染色体小。据调查,种内染色体数目不同,尚属计数误差。作者并对紫菜的单性生殖和减数分裂提出了可能解决的途径  相似文献