查询词典 backcross

After several generations you will need to backcross to one of the previous strains.

必须继续保留原线鱼种，因为经过异种杂交后往往需要原线鱼种做反交。

Keywords: Male sterile line; Alfalfa ; backcross; tissue culture; cyto-morphology

中文关键词：雄性不育系；苜蓿；回交；组织培养；细胞形态学

Three promisingmale sterile individualswere selected using the marker information, which had both less genetic drag and carry-over for further backcross.

通过分析选择了其中3个单株为理想的雄性不育株，可用于进一步回交。

The effect of QTL mapping was influenced by many factors including population structure and size, number of QTLs, density of genetic markers, heritability of traits etc., especially the genetic and statistic models, so it is essential to select appropriate method according to actual situations before mapping QTLs. In this study, backcross population for QTL mapping was constructed by computer simulation in order to study power of detection and mapping precision of QTLs at different levels of factors.

影响QTL 定位效果的因素很多，包括群体类型、规模、涉及的QTL 数目、遗传标记的密度、性状遗传力等等，特别是分析中使用的遗传和统计模型对QTL 检测和定位有较大的影响。

Tibetanum were more abundant, which can be used to broaden the genetic basis of common wheat. Cluster analysis exhibited that wild emmer had a closer consanguine relationship to hexaploid wheat, as compared to Aegilops tauschi. In addition, it was found that there was a closer genetic relationship in chloroplast genome of common wheat and T. petropavlavskyi, which indicated that T. petropavlavskyi probably derived from the backcross between common wheat and Polish wheat.

结果］与普通小麦相比，斯卑尔脱小麦和西藏半野生小麦等群体内的叶绿体遗传变异更丰富，可以作为普通小麦新的细胞质遗传变异来源；与粗山羊草相比，野生二粒小麦与六倍体小麦间存在更近的亲缘关系，这与前人关于二粒小麦是六倍体细胞质供体的研究结果相印证；研究还发现，新疆稻麦与普通小麦在叶绿体基因组上具有很近的亲缘关系，为新疆稻麦是由波兰小麦与普通小麦杂交再由普通小麦回交后产生的假说提供了分子水平上的证据。

The decomposition of chromosome was a main problem in construction of BAC library. DNA discompose would be avoided or decreased by adjustments of component and pH of chromosome extraction buffer or pre-electrophoresis for 6-8h before digestion. Identification of inter-species hybrids was a necessary step for creating a new germplasm. Two samples were selected from offspring of hybridization and backcross of a cross between cabbage and Chinese cabbage.

鉴定种间杂种是利用远缘杂交创造新种质时的一项重要工作，本研究运用细胞核DNA含量流式测定技术，对甘蓝和白菜杂交及回交各世代的DNA含量进行检测，以监控遗传物质在不同材料间的流向，并从回交二代植株群体中筛选了两个材料，具有和白菜差异不显著的DNA含量，可推断其为核质杂种。

The results showed the resistance was controlled by at least two pairs of genes, and was incompletely recessive. Effect of backcross was very significant and that of reciprocal cross was not. Resistance was dominated by nuclear genes, narrow inheritability was comparatively high. The resistance was in keeping with additive-dominance model, and dominance was dominating, and showed a quantitative character.

结果表明：苦瓜对白粉病的抗性受两对以上基因控制，两对主基因抗病相对感病为不完全隐性，回交效应极显著，正反交效应差异不显著，抗病性主要受核基因控制，两对主基因的狭义遗传力较高，符合加性－显性模型，加性效应较大，抗性效应在亲本和F1间存在极显著正相关，表现为数量性状遗传的特点。

The results indicated that detection of SSR polymorphisms was one of the most efficient and accurate measures to study the genetic differences among rice varieties, which was helpful to the discovery of favorable genes and their utilization in advanced-backcross introgression populations.

试验结果表明检测SSR多态性是研究水稻品种之间遗传差异的高效、准确的手段之一，为高代回交导入群体的有利基因发掘和利用提供了有益的参考。

Methods: The authors set up theF1×NZW backcross mice model and u sed polym orphic microsatellite markers and quantitative trait locus analysis.

建立F1×NZW回交小鼠模型，采用覆盖小鼠19条染色体的多态性微卫星遗传标记及数量性状位点分析进行基因定位。

These suppressors can restore septation and conidiation in the absence of the SEPH protein. By the cross and backcross, the temperature sensitive strain Sin110 was obtained and the bypass of SIN pathway was identified.

通过对突变株进行杂交和回交等遗传学分析，排除了sepH回复突变菌株，获得了能使sepH胞质分裂恢复正常的温度敏感菌株Sin110，证实了SIN途径具有对应反向的旁路途径的存在。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。