二倍的

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。

He is twice as old as I.

他的年龄是我的二倍。

Low Dilatabilit y and great waxiness,its tenacity is twice more than common gypsum,its the ideal material forodontology model

可塑性的石膏，韧性比一般超硬石膏大二倍，是医学齿科模型的理想材料。

BACKGROUND: Embryonic stem cells develop from early blastular inner cell mass. Under proper condition, ESCs can maintain undifferentiated state in vitro, normal diploid nuclear type, and proliferative potential. In addition, ESCs possess multi-directional differentiation capacity and can differentiate into all sorts of cells of three germ layers.

背景：胚胎干细胞来源于发育早期囊胚的内细胞团，适当条件下能在体外维持未分化状态、正常二倍体核型及无限增殖能力，且具有多向分化潜能，能够发育分化成机体3个胚层的所有类型细胞。

Doubled pollens grains and calli may be formed in this way and non-haploid plants may be produced.

通过这些方式，可以形成加倍的花粉粒和愈伤组织，由此可产生自然加倍的二倍体植株。

The catalytic activity of the chloroaluminate ionic liquids originated from dissociation of AlCl3 from dimeric anions Al2Cl7-.

离子液体中的催化活性来源于由二倍体阴离子Al2Cl7-解离生成的游离AlCl3。

In the studies on transferring and identifying alien chro-mosomes into wheat,the combined use of mitotic and meioticchromosome N-banding is also successfully practiced in deter-mination of T.durum-H.villosa amphipoid,five wheatalien disomic additions with H.villosa chromosomes,〓〓,alien sulstitution line with chromosome 〓 andsome translocation lines.

在外源染色体导入、鉴定研究中，利用根尖有丝分裂中期染色体和花粉母细胞减数分裂中期Ⅰ染色体的N-分带，快速、准确地鉴定了硬粒小麦一簇毛麦双二倍体、普通小麦一簇毛麦异耐加系V〓、V〓、V〓、V〓和V〓，普通小麦一簇毛麦异代换系V〓以及一些具有易位的杂种后代。

In this study,Amplified fragment length polymorphism analysis was carried out by using 23 pairs of EcoRI-NN/MseI-NNN selective primers in amplification of the DNAs from reciprocal F_1 hybrids of Cucumis hystrix Chakr.and C.

为了研究细胞质背景对基因组序列丢失的影响，利用23对Eco RI-NN/Mse I-NNN选择性引物对Cucumishystrix与栽培黄瓜C.sativus的正反交F_1、异源双二倍体及亲本DNA进行AFLP分析。

The morphological observation showed that the two monosomic addition lines could form head normally, but the characters existed difference between the addition- lines and diploid parent.

对2个单体异附加系的植株形态学性状进行了初步观察，结果显示2个附加系均能正常结球，但球形的形态与二倍体结球甘蓝存在明显差异。

The extra pronuclear of triploid zygotes after IVF is from sperm and the zygotes have no implantation value.

IVF后3PN卵子中多余的原核多为精子来源，没有移植价值；ICSI后3PN中多余的原核非精子来源，ICSI后3PN中二倍体率与IVF相比显著增高，在患者ICSI后无2PN卵子时可考虑行植入前遗传学诊断。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。