染色体

Chromosome observation of the male sterile line and fertile line, parents of hybrid combination and F1 indicated that the chromosome number of the male sterile line is the same as that of fertile line 2n=2x=24; Pollen parent (Tagetes putula PHBO029) is tetraploid 2n=4x=48; the F1 is triploid 2n=3x=36 with hybrid vigor.

通过对不育系、正常可育系以及杂交组合父母本、子一代的染色体数目观察发现：万寿菊雄性不育系的染色体数目与正常可育系相同，均为2n=2x=24；孔雀草PHBO029为四倍体2n=4x=48，它与万寿菊不育系杂交、其杂种为具有杂种优势的三倍体2n=3x=36。

Department of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China Abstract: Chromosome section is the base for us to do the chromosome teratogenic research.

新疆农业大学资源环境学院，乌鲁木齐 830052 摘要：染色体制片是对染色体畸变进行深入研究的基础。

Terminalization The movement of chiasmata to the end of the bivalent arms, a process that may occur during late prophase I of meiosis.

交叉移端：发生在第一次减数分裂后期，染色体交叉向二价体染色体臂的末端移动的过程。

Villosum to wheat using ph lb mutant, as well as the development, identification and cytogenetic characteristics of a trigeneric hybrid germplasm with useful genes from Tavestivum, D.villosum and S.cereale.

结果发现：仅在50μg/mlBrdu溶液20～21h的培养条件下，9.3％的黑麦根尖细胞染色体产生脆性位点表达，主要分布在三条黑麦染色体的四个不同位点上，频率分别为1.4％、2.1％、4.3％和5.7％。

In the end of this paper, the research advance of stress resistance gene location on the fourth chromosome set of Triticum was discussed.

最后讨论了小麦种、属第4部分同源群染色体抗逆性基因定位的研究进展，并强调应重视对小麦种、属第4部分同源群染色体的研究和利用。

It is caused by mutations in dyskerin-encoding genes, telomerase-encoding RNA component genes and reverse transcriptase genes, as well as other uncharacterized genes. There are three inherited forms, including X-linked, autosomal dominant and autosomal recessive inheritance.

先天性角化不良是与编码角化不良蛋白基因、编码端粒酶的RNA组份基因、编码端粒酶的逆转录酶基因突变及其他未确认的致病基因突变引起的基因病，其遗传方式有：X-性联隐性遗传、常染色体显性遗传及常染色体隐性遗传。

In this paper,an improved genetic algorithm is proposed to overcome the shortage of early convergence and stagnation in the traditional genetic algorithm,which is based on unconvertible rate of crossover operator and mutation operator.Moreover,the user page interest measure threshold is introduced into the association rules mining.

针对传统遗传算法在提取关联规则问题时常采用固定染色体交叉概率和染色体变异概率，容易出现早熟、收敛速度较慢的问题，提出了改进的遗传算法，并在关联规则的提取中增加了用户页面兴趣度这一阈值，成功地运用到某商业网站服务器日志挖掘。

With the new herbicide-oryzalin to treat the callus with young buds of coloured Zantedeschia aethiopica in vitro, the effects of oryzalin of different concentration and time duration on doubling chromosome of coloured Z. aethiopica were studied.

用新型除草剂Oryzalin作为彩色马蹄莲体细胞染色体加倍的诱导剂，以愈伤组织芽点为处理材料，研究了不同处理浓度和处理时间的除草剂对彩色马蹄莲染色体加倍的影响。

Objective To study the technique and diagnostic value of fluorescence insitu hybridization in chromosome abnormality for prenatal diagnosis. Methods Amniocenteses were performed in 34 pregnant women of 16～23 gestational weeks with indications for prenatal diagnosis. The amniotic fluid samples were cultured in Chang's medium.

荧光原位杂交(fluorescence in situ hybridization， FISH)是分子杂交与组织化学相结合的一项新技术，近年来用于人类染色体分析，它能快速、准确地确定在传统方法中无法判别的染色体异常，特别对来源不明的标记染色体能作出正确诊断［1，2］。

Chiasmata also help to hold homologs together until the start of anaphase, thus helping to ensure the correct distribution of chromosomes into the daughter nuclei.

交叉还可以使同源染色体始终在一起直到细胞减数分裂的后期，这样确保了染色体可以正确的进入子细胞。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！