有时，那是因为在新的人群中，人们其他的基因作用下的遗传背景掩盖了基因A对抑郁的效应。
Sometimes it is because in the new population, the genetic background for their other genes masks the effect of gene a on depression.
讨论了一致的遗传背景对QTL研究的重要性，以及不同QTL的聚合效应及互作关系对育种实践的意义。
The importance of a uniform genetic background for studying QTL, and the significance of pyramiding and interacting effects among different QTLs in rice breeding were discussed.
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