back cross

基本解释

Molecular marker assisted selection(MAS) can provide a rapid, accurate, and efficient tool for selecting target genes in back cross breeding.
分子标记辅助选择（MAS）因其对目标基因的快速准确选择为回交育种提供有效工具。
The experiments of cross and back cross showed that these mutations were belonged to recessive mutation of nucleus gene and controlled by a recessive monogene.
通过正反交试验表明，大豆叶绿素缺失突变属于核基因隐性突变，而且是由一隐性单基因所控制的。
The result indicated that the genetic construction of congenic inbred strains was similar with the parents through more than the 20th generation back cross mating except for destination gene.
结果表明，经20代以上的回交，除目的基因外，均为轮回亲本的遗传组成。

The American Red Cross says a rescuer should first hit the person on the back five times between the shoulder bones.
And there's been some efforts cross-culturally, to go back to the question this young man asked before looking at cross-cultural differences in toilet training and weaning, which are really big differences, to see if they correspond in any interesting way to personality differences.
回到刚才那位同学提出的问题，确实也已经有些跨文化的研究试图探究,在如厕训练和断奶上的跨文化差异,这些差异是非常大的，而这些研究的目的，是为了看看这些跨文化上的差异,是否与人格差异存在着某种联系。
耶鲁公开课 - 心理学导论课程节选
It's a more powerful method than something called a cross-sectional study, and I'll come back in a later lecture and talk about these in more detail, but a cross-sectional study means you're taking a snapshot of a population of people at one time.
这种方法比所谓的横断面研究更加有效,我将在以后的课中,再仔细讨论这个问题,但横断面研究是指,你一次记录下一群人的状况
耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

It look like the 50 is going to cross back above it on a golden cross.
FORBES: 8 Big Picks to Win in Q4 and Beyond

回交
The result indicated that the genetic construction of congenic inbred strains was similar with the parents through more than the 20th generation back cross mating except for destination gene.
结果表明,经20代以上的回交,除目的基因外,均为轮回亲本的遗传组成。
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