染色体数目

• 1 . chromosome number ( 2n ) and fundamental number ( fn ) the chromosome number and karyotype of amphioxus branchiostoma belcheri tsingtauense were studied using embryonic cells of the animal
  染色体数目( 2n )和臂数( fn )用青岛文昌鱼的胚胎细胞作材料，对其染色体数目和核型进行研究。
• Polyploidy is far more common in plants than in animals and very high chromosome number may be found ; for example in octaploids and decaploids ( containing eight and ten times the haploid chromosome number )
  多倍体现象在植物中比在动物中更为普遍，且染色体组数量较大，如八倍体和十倍体（即含有八倍或十倍的单倍染色体数目） 。
• Cytological genetic analysis revealed that the chromosome number of gynogenetic grass carp is 48 and the karyotype is 18m + 24sm + 6st , fundamental arm number ( nf ) is 90 , just as those of the common grass carp
  此外，对雌核发育草鱼细胞遗传学分析证实所得雌核发育草鱼的染色体数目为48条，其核型公式为18m + 24sln + 6st ;臂数为哪习o 。
• The counting of 150 well - spread samples revealed that the number of the chromosomes ranged from 18 to 38 , but the modal number of the chromosome was 36 , which was in proportion to 66 %
  计数150个染色体分散好的中期相，发现染色体数目的变化范围是18至38条，长度为1 . 4至3 . 7 m ，染色体的众数是36 ，占150个中期相的66 ，说明青岛文昌鱼染色体的数目是36 。
• First , the morphology , physiology of seed , biological traits , geographic distribution , ecological and community characteristics , karyotypes , nitrogenase activity of root nodules and chemical constituents of e . mollis were reviewed , respectively
  本文对翅果油树的形态特征、种子生理生化、生态学特征、染色体数目、群落生态、生物学特性、固氮生物学以及矿物质和化学成分等方面研究进行了综述。
• However , only three species of the cephalochordate including b . lanceolatum , b . floridae , and b . belcheri , have so far been studied for their chromosome numbers , and the karyotypic analysis and banding study of amphioxus chromosomes remains largely untouched
  Floridae 、 b belcheri三种文昌鱼染色体数目。有关文昌鱼染色体核型和带型的研究尚未见任何报道，文昌鱼染色体核型和带型的研究将为比较基因组学和细胞遗传学研究提供珍贵的背景资料。
• Abstract : some problems related to “ variation of chromosome number ” in some teaching materials of genetics are presented in this article . these problems are involved in some conceptions such as haploid , chromosome set and aneuploid that are defined unclearly and confusedly in these books
  摘要指出了高校有关遗传学教材“染色体数目变异”一节中，部分概念如单倍体、染色体组、非整倍体等存在的概念表述不清、前后矛盾等问题，并提出了相应的修改意见。
• Several kinds of herbicides treating together show an antagonistic action also exist , even tend to intensify . the results also indicate that the inductive effect was weakened when 2 - ethy - 4 - chloro sodium hydration operated with other herbicides . nc - 302d ( + ) can evidently increase the frequencies of numerical and structural chromosomal aberrations
  除草剂精禾草克试验组泥鳅染色体数目畸变率均有明显上升，有的组甚至与对照组差异极显著( p 0 . 01 ) ；各试验组染色体结构畸变率与对照组差异均极显著( p 0 . 01 ) 。
• In nature conditions , without the injection of the extraneous hormone , the females and males of f _ 9 - f _ 12 could mate each other to produce new next generation of tetraploids . with the stable genetic tetraploidy and the fertility in the nature environments , this allotetraploid population possessed the key factors to form a new species with 200 chromosomes
  F _ 9 ? f _ ( 12 )染色体数目的稳定性和正常的性腺结构以及自然条件下的生殖传代行为，说明该异源四倍体鲫鲤已成为一个染色体数目为4n = 200 、遗传性状稳定的新型四倍体鱼群体，具备形成一个新的种群所需的关键因素。
• Their flowers and fruits were removed in this experiment to enhance them to take branch roots on the stems , and then the branch roots were used as materials . five mitosis metaphase cells , with their chromosomes well scattered , were counted . chromosome number of hup is 2x = 24 , and its karyotype formula is 2n = 2x = 24 = 8m + 12sm + 4st , being to " 3b " of stebbins
  本实验采取去其花、果实，促其茎节上长侧根的办法，以其侧根为实验材料，统计了5个分散较好的有丝分裂中期细胞，其染色体数目为2x = 24 ，核型公式为2n = 2x = 24 = 8m + 12sm + 4st ，核型类型为3b型。