杂种性

The molecular markers identified here would be useful in introducing a set of new and known sterility-neutral alleles to solve the pollen sterility problem in subspecific Ft hybrids.

本研究获得的分子标记将有助于聚合尽可能多的中性亲和基因以解决亚种问F1杂种的花粉不育性问题。

The fertility of pollen F1 of trigeneric hybrid is low.

三属杂种F1的花粉育性较低。

Observation were made on the fertilization and embryo development in wide hybridization between Triticum aestivum L.

本文还报道了小麦与节节麦远缘杂交时雌雄性核的结合及杂种胚和胚乳的发育情况，探讨了小麦与节节麦杂交结实率低在胚胎学方面的原

Thus it is obvious that the weak homology existedamong genomes A, B, D and 〓. However, the rare unreduced gemetes and near-unreduced ones with the loss of several chromosomes could be produced by the highlyunequtional division of univalents at the first meisis and the normal second division,which gave the F1 hybrid the partial fertility.

但通过第一次减数分裂时单价体的极不对称的分离及正常的第二次分裂，可形成少量未减数配子和丢失了少数几条染色体的近未减数配子，使杂种〓表现部分可育性。

But theimprovement was still needed because of its late maturity and low grain-weight. The NChybrid is crossing with other vulgare so as to breed new NC hybrid suitable forproduction.

但在千粒重和早熟性上还有欠缺，目前正用其它普通小麦品种进行转育，以期培育出生产上能用的核质杂种小麦。

In the experiment ,a study on the polymorphisms of the 62bp of Prepro-orexin gene in ten breeds including Erhualian, Large White and Landrance × Large White × Erhualian crossbreeds was performed by mean of PCR-SSCP and PCR-RFLP.The litter size and growth performance between different genotype of some breeds were analysized.

本实验用PCR-SSCP和PCR-RFLP两种方法在二花脸、大约克及长·杂种猪等十个猪群内进行了Prepro-orexin基因第62bp位点处的多态性的检测，并且分析各基因型与繁殖性状、生长性状之间的相关性。

The blacks mongrelizing the pure white race.

种族主义者污蔑性用语使血统混合，使成杂种

The result would be used in tobacco breeding.4 SRAP technology is used to study the genetic differences among different types of tobacco, including flue-cured tobacco, oriental tobacco, maryland tobacco, burley tobacco, and air/sun cured tobacco, five pairs of primer combinations which can amplify characteristic bands has been screened. Among the five combinations, two of them (SF25*SR2 and SF3*SR26) can distinguish air-cured tobacco including maryland tobacco and Burley tobacco from the other cultivated forms; SF20*SR14 can distinguish sun cured tobacco including oriental tobacco and sun-cured tobacco; SF16*SR14 can distinguish flue-cured tobacco and air-cured tobacco, and SF22*SR14 can distinguish DBJ599 with specisl aroma and the other flue-cured tobacco.5 8 varieties , which represent the different types of tobacco, are divided into 3 groups. I: G-28, II:DBJ599、MD40、By21, III: Basma、Sumsun、XNS、QCT. The cluster analysis result es consistant with experience evatuation.6 Anorthogonal design was used to optimize a ILP-PCR system with 5 factors (DNA, Mg2+, dNTP, primer and Taq polymerase) at 4 levels.The result showed the optimized ILP-PCR system for Nicotiana tabacum L. was: 2uL10×PCRbuffer, 20ng template DNA, Mg2+ 2.0mmol/L, dNTP 150umol/L, primer 0.3umol/L, Taq DNA polymerase 1 U in a total of 20uL reactionsolution.

研究结果可作为烤烟与香料烟类型间的杂种鉴定利用的实验与理论依据。4、利用SRAP标记技术，研究和分析了烤烟、晒烟、晾烟、白肋烟、香料烟等不同栽培类型间的基因型差异，初步筛选出了能够在分子水平上反映不同烟草类型差异的特征性标记带：晾烟MD40、Ky17、Burley21、TN90基因型共有的特征带有两对引物组合，分别为SF25*SR2和SF3*SR26；晒烟小牛舌、青梗、小花青和香料烟Sumsun、komotini Basma、Xanthi Basma共有的特征带引物组合为SF20*SR14；NC89、K326、G-28、大白筋和MD40、Ky17、Burley21、TN90共有的特征带引物组合为SF16*SR14，烤烟中大白筋599的特征带引物组合SF22*SR14.5、利用61对SRAP引物组合，研究了普通烟草不同类型间的亲缘关系，将普通烟草类型间8个不同供试材料划分为3类别。I：烤烟类型G-28II：白肋烟类型(MD40、By21、大白筋599III：香料烟类型(Basma、Sumsun、小牛舌、千层塔)。

However, crossing fertility between them was lower than that of mating in and in, and fertilized egg of reciprocal crossing can be incubated and produced F〓 without prezygotic isolation. Among all combinations of reciprocal crossing, crossing of wild male quail×female small-type domestic quail are proved to produce the best effect.

野生日本鸣鹑与家鹑群体之间的杂交能育性低于同种群交配水平，但可以实现正、反交，产生受精卵、孵化出杂种一代，不存在合子前生殖隔离；在所有正、反交组合中，以野雄鹑×小型雌家鹑的效果最好。

Results of interpopulation crossing test of mating, fertilization rate, embryo growth and hatchability under the condition of cage feeding indicated that:(1) due to difference in body size, morphology, habits and characteristics and reproducing season, crossing fertility between wild Japanese quail in China and domestic quail population was lower than that of intrapopulation mating, but fertilized egg through reciprocal crossing could be incubated and produced F1 without prezygotic isolation;(2) crossing of wild male quail ?female small-type domestic quail produced the best effect among all combinations of reciprocal crossings.

通过关于笼饲环境下交配行为、受精率、胚胎发育、种蛋孵化率的种群间杂交试验证明：由于体量、形态、习性、繁殖季节性的差异，我国境内的野生日本鸣鹑与家鹑群体之间的杂交能育性低于同种群交配水平，但可以实现正、反杂交，产生受精卵、孵出杂种一代，不存在合子前生殖隔离；在正反杂交组合中，以野雄鹑X小型雌家鹑的效果最好。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。